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Black widows are notorious spiders identified by the colored, hourglass-shaped mark on their abdomens. Several species answer to the name, and they are found in temperate regions around the world.
This spider's bite is much feared because its venom is reported to be 15 times stronger than a rattlesnake's. In humans, bites produce muscle aches, nausea, and a paralysis of the diaphragm that can make breathing difficult; however, contrary to popular belief, most people who are bitten suffer no serious damage-let alone death. But bites can be fatal-usually to small children, the elderly, or the infirm. Fortunately, fatalities are fairly rare; the spiders are nonaggressive and bite only in self-defense, such as when someone accidentally sits on them.
The animals most at risk from the black widow's bite are insects—and male black widow spiders. Females sometimes kill and eat their counterparts after mating in a macabre behavior that gave the insect its name. Black widows are solitary year-round except during this violent mating ritual.

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The Komodo dragon has four powerful weapons at its disposal that it uses to dispatch prey: A powerful tail capable of knocking animals such as deer and pigs off their feet, 60 teeth, serrated like shark teeth, that can rip flesh to the bone in a single bite; long claws to latch onto prey, and venom that can kill an adult water buffalo within a few days.

Males can grow to 10 feet in length and can weigh as much as 200 pounds, meaning they are no lightweight either! These lizards are also deceptively smart and cunning, and can hunt alone or in a group.

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The crown-of-thorns starfish, Acanthaster planci, is a large starfish that preys upon hard, or stony, coral polyps (Scleractinia). The crown-of-thorns starfish receives its name from venomous thorn-like spines that cover its upper surface, resembling the biblical crown of thorns. It is one of the largest starfish in the world.A. planci has a very wide Indo-Pacific distribution. It is perhaps most common around Australia, but can occur at tropical and subtropical latitudes from the Red Sea and the East African coast across the Indian Ocean, and across the Pacific Ocean to the west coast of Central America. It occurs where coral reefs or hard coral communities occur in the region.

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The crown-of-thorns starfish, Acanthaster planci, is a large starfish that preys upon hard, or stony, coral polyps (Scleractinia). The crown-of-thorns starfish receives its name from venomous thorn-like spines that cover its upper surface, resembling the biblical crown of thorns. It is one of the largest starfish in the world.A. planci has a very wide Indo-Pacific distribution. It is perhaps most common around Australia, but can occur at tropical and subtropical latitudes from the Red Sea and the East African coast across the Indian Ocean, and across the Pacific Ocean to the west coast of Central America. It occurs where coral reefs or hard coral communities occur in the region.

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By Pattarapon and Pakanun

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Dolphins have an impressive reputation. Not only are they incredibly intelligent, but they also tend to interact with humans on a regular basis⁠. But unfortunately, just because dolphins have a perpetual grin and an overall friendly demeanor doesn't mean they're safe.
Sure, it's a vicious world out there in the animal kingdom, but dolphins don't only kill other creatures to survive. Sometimes, they have mysteriously murderous motivations. According to the New York Times, dolphins "are killing fellow mammals in droves, wielding their beaks as clubs and slashing away with rows of sharp teeth."

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Electric eels can generate up to 800 volts of electricity, but only a fully grown fish can discharge this much.  The adults may be about 2 meters in size, while the young fish or fish.  will produce a small amount of electricity, not more than 100 volts
Electric eels can generate electricity by a cell that generates electricity.  in the organs used for generating electricity  And it can control these cells to work simultaneously.  This cellular system has a nucleus that receives instructions.  that when organs produce electricity  will generate electricity  by the power generation cells  will secrete a substance called acetin choline, which helps to create  temporary route  with low electrical resistance  The electricity will be created for  Used for self-defense and foraging only, most people who die from electric eels will be shock and drown.

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There are more than 3,000 species of snakes on the planet and they’re found everywhere except in Antarctica, Iceland, Ireland, Greenland, and New Zealand. About 600 species are venomous, and only about 200—seven percent—are able to kill or significantly wound a human.

Nonvenomous snakes, which range from harmless garter snakes to the not-so-harmless python, dispatch their victims by swallowing them alive or constricting them to death. Whether they kill by striking with venom or squeezing, nearly all snakes eat their food whole, in sometimes astoundingly large portions.

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Taenia solium, also known as the pork tapeworm, can cause epileptic seizures and other neurological problems in humans from ingesting eggs containing infective larvae. The breakdown of the egg’s shell occurs in the intestines, allowing the larvae to exit and enter the bloodstream. Once in the circulation, larvae may settle in many types of body tissues.

Open wide. Rjgalindo, CC BY

Sometimes larvae cross the blood-brain barrier and enter the central nervous system (CNS), where the embryos develop into fluid-filled cysts leading to a condition known as neurocysticercosis which results in seizures and is one of the most dangerous parasitic CNS infections worldwide. Diagnosis of neurocysticercosis is difficult due to the lack of specific clinical symptoms. The disease – which normally affects people in South America, Asia and sub-Saharan Africa – has been exceptionally rare in Western countries, however a few cases have been reported in the UK and the US.

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Well, sperm whales sunk sailing ships eight times between 1805 and 1855. The most famous example is the Essex, which was charged and rammed by an eighty-five foot bull sperm whale, punching a hole in the side of the ship. While he did not directly kill any of the crew, twelve of the crew were lost and died at sea or were cannibalized by necessity. It is likely that this whale took it upon himself to protect the herd being attacked by Essex’s crew. Sperm whales were also supposedly the most dangerous whales to hunt, and killed whalers while fighting for their lives. The infamous Mocha Dick, a seventy foot albino whale from off the Chilean coast survived 100 attacks by whalers, attacked several ships, and supposedly killed many people. He, together with the giant who sunk the Essex, were inspirations for Moby-Dick

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Some of the animals on this list are dangerous for attacking humans, not necessarily killing them. While that information is difficult to find for each animal, we included the number of attacks or deaths per year that each individual animal caused when we could find that information.The moray eel tends to hang out in tropical seas. They have thick, scaleless skin and sharp teeth that enable them to inflict serious wounds on their prey, including humans, when disturbed. People eat Moray eels in some areas of the world, but their flesh can be toxic and cause illness or death if not prepared properly.

Its cousin, the electric eel, discharges 300 to 650 volts when it feels threatened. Human deaths by both eels are extremely rare but can happen.

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Three species are extant: The most common, the southern cassowary, is the third-tallest and second-heaviest living bird, smaller only than the ostrich and emu. The other two species are represented by the northern cassowary and the dwarf cassowary. A fourth but extinct species is represented by the pygmy cassowary.

Cassowaries feed mainly on fruit, although all species are truly omnivorous and take a range of other plant foods, including shoots and grass seeds, in addition to fungi, invertebrates, and small vertebrates. Cassowaries are very wary of humans, but if provoked, they are capable of inflicting serious, even fatal, injuries to both dogs and people. The cassowary has often been labeled "the world's most dangerous bird

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Elephant are the largest existing land animals. Three living species are currently recognised: the African bush elephant, the African forest elephant, and the Asian elephant. They are the only surviving members of the family Elephantidae and the order Proboscidea. The order was formerly much more diverse during the Pleistocene, but most species became extinct during the Late Pleistocene epoch. Distinctive features of elephants include a long proboscis called a trunk, tusks, large ear flaps, pillar-like legs, and tough but sensitive skin. The trunk is used for breathing, bringing food and water to the mouth, and grasping objects. Tusks, which are derived from the incisor teeth, serve both as weapons and as tools for moving objects and digging. The large ear flaps assist in maintaining a constant body temperature as well as in communication. African elephants have larger ears and concave backs, whereas Asian elephants have smaller ears, and convex or level backs
levels in an elephant in musth can be on average 60 times greater than in the same elephant at other times (in specific individuals these testosterone levels can even reach as much as 140 times the normal).[2] However, whether this hormonal surge is the sole cause of musth, or merely a contributing factor, is unknown.

Scientific investigation of musth is problematic because even the most placid elephants become highly violent toward humans and other elephants during musth

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Komodo dragons are the world’s largest lizards, growing 10-feet long and weighing about 150 pounds. In recent years, komodo dragons have become somewhat of a tourist attraction in Indonesia. Komodo National Park invites tourists to see this large lizard in its natural habitat. But these prehistoric monsters look as vicious as they are — komodo dragons have killed four people over the past 33 years. The last fatal attack occurred in 2009.
Komodo dragons have a powerful bite packed with venom that delivers toxins that inhibit blood clotting. Trauma from the bite, bacteria from the komodo dragon’s mouth and rapid blood loss contribute to their ability to kill prey (humans included).
Humans Killed: 4 people (in total that have ever been recorded)
Where They Can Be Found: Komodo Island and Lesser Sunda Islands of Indonesia
Notable Features: Shark-like teeth, clawed feet, 10 feet in length

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Hippopotamuses love water, which is why the Greeks named them the “river horse.” Hippos spend up to 16 hours a day submerged in rivers and lakes to keep their massive bodies cool under the hot African sun. Hippos are graceful in water, good swimmers, and can hold their breath underwater for up to five minutes. However, they are often large enough to simply walk or stand on the lake floor, or lie in the shallows. Their eyes and nostrils are located high on their heads, which allows them to see and breathe while mostly submerged.

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It is a mammal in the carnivore family.  By using the family name Hyaenidae along with 4 species that are still alive.  (Each species has its own genus.) Hyenas are the 5th smallest family in the carnivore order.  and is one of the smallest mammals [2], although less diverse.  Hyenas are unique and important in most African ecosystems.[3]

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The cheetah (Acinonyx jubatus) is a large cat native to Africa and central Iran. It is the fastest land animal, estimated to be capable of running at 80 to 128 km/h with the fastest reliably recorded speeds being 93 and 98 km/h, and as such has several adaptations for speed, including a light build, long thin legs and a long tail. It typically reaches 67–94 cm at the shoulder, and the head-and-body length is between 1.1 and 1.5 m. Adults weigh between 21 and 72 kg. Its head is small and rounded, and has a short snout and black tear-like facial streaks. The coat is typically tawny to creamy white or pale buff and is mostly covered with evenly spaced, solid black spots. Four subspecies are recognised

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The blue-ringed octopus is very small in size. About the size of a golf ball only. But size is not a problem for the severity of the poison at all. Because the venom can kill a person within minutes, and most importantly, it does not have an antidote if bitten by a blue-ring octopus. You won't feel much pain. But the poison will begin to damage your nervous system. After that, you'll feel weak and you'll start to lose control. The respiratory system begins to fail, after which it eventually dies.

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Poison dart frog (also known as dart-poison frog, poison frog or formerly known as poison arrow frog) is the common name of a group of frogs in the family Dendrobatidae which are native to tropical Central and South America.[2] These species are diurnal and often have brightly colored bodies. This bright coloration is correlated with the toxicity of the species, making them aposematic. Some species of the family Dendrobatidae exhibit extremely bright coloration along with high toxicity, while others have cryptic coloration with minimal to no amount of observed toxicity.[3] The species that have great toxicity derive this from their diet of ants, mites and termites.[3][4] Other species however, that exhibit cryptic coloration and low to no amounts of toxicity, eat a much larger variety of prey.[4]Many species of this family are threatened due to human infrastructure encroaching on their habitats.

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Dyeing poison dart frog (Dendrobates tinctorius)

Most species of poison dart frogs are small, sometimes less than 1.5 cm (0.59 in) in adult length, although a few grow up to 6 cm (2.4 in) in length. They weigh 1 oz. on average.[7] Most poison dart frogs are brightly colored, displaying aposematic patterns to warn potential predators. Their bright coloration is associated with their toxicity and levels of alkaloids. For example, frogs of the genus Dendrobates have high levels of alkaloids, whereas Colostethus species are cryptically colored and are not toxic.[4]

Poison dart frogs are an example of an aposematic organism. Their bright coloration advertises unpalatability to potential predators. Aposematism is currently thought to have originated at least four times within the poison dart family according to phylogenetic trees, and dendrobatid frogs have since undergone dramatic divergences - both interspecific and intraspecific - in their aposematic coloration. This is surprising given the frequency-dependent nature of this type of defense mechanism.[3][8]

Adult frogs lay their eggs in moist places, including on leaves, in plants, among exposed roots, and elsewhere. Once the eggs hatch, the adult piggybacks the tadpoles, one at a time, to suitable water: either a pool, or the water gathered in the throat of bromeliads or other plants. The tadpoles remain there until they metamorphose, in some species fed by unfertilized eggs laid at regular intervals by the mother.[9]

The skin of the phantasmal poison frog contains epibatidine

The chemical defense mechanisms of the Dendrobates family are the result of exogenous means.[21] Essentially, this means that their ability to defend has come through the consumption of a particular diet - in this case, toxic arthropods - from which they absorb and reuse the consumed toxins.[21] The secretion of these chemicals is released by the granular glands of the frog.[21] The chemicals secreted by the Dendrobatid family of frogs are alkaloids that differ in chemical structure and toxicity.[21]

Many poison dart frogs secrete lipophilic alkaloid toxins such as allopumiliotoxin 267A, batrachotoxin, epibatidine, histrionicotoxin, and pumiliotoxin 251D through their skin. Alkaloids in the skin glands of poison dart frogs serve as a chemical defense against predation, and they are therefore able to be active alongside potential predators during the day. About 28 structural classes of alkaloids are known in poison dart frogs.[5][22] The most toxic of poison dart frog species is Phyllobates terribilis. It is believed that dart frogs do not synthesize their poisons, but sequester the chemicals from arthropod prey items, such as ants, centipedes and mites - the diet-toxicity hypothesis.[23][24] Because of this, captive-bred animals do not possess significant levels of toxins as they are reared on diets that do not contain the alkaloids sequestered by wild populations. Nonetheless, the captive-bred frogs retain the ability to accumulate alkaloids when they are once again provided an alkaloidal diet.[25] Despite the toxins used by some poison dart frogs, some predators have developed the ability to withstand them. One is the snake Erythrolamprus epinephalus, which has developed immunity to the poison.[26]

Chemicals extracted from the skin of Epipedobates tricolor may have medicinal value. Scientists use this poison to make a painkiller.[27] One such chemical is a painkiller 200 times as potent as morphine, called epibatidine; however, the therapeutic dose is very close to the fatal dose.[28] A derivative, ABT-594, developed by Abbott Laboratories, was named as Tebanicline and got as far as Phase II trials in humans,[29] but was dropped from further development due to dangerous gastrointestinal side effects.[30] Secretions from dendrobatids are also showing promise as muscle relaxants, heart stimulants and appetite suppressants.[31] The most poisonous of these frogs, the golden poison frog ( Phyllobates terribilis), has enough toxin on average to kill ten to twenty men or about twenty thousand mice.[32] Most other dendrobatids, while colorful and toxic enough to discourage predation, pose far less risk to humans or other large animals.[citation needed ]

Ranitomeya amazonica

Conspicuousness

Conspicuous coloration in these frogs is further associated with diet specialization, body mass, aerobic capacity, and chemical defense.[8] Conspicuousness and toxicity may be inversely related, as polymorphic poison dart frogs that are less conspicuous are more toxic than the brightest and most conspicuous species.[33] Energetic costs of producing toxins and bright color pigments lead to potential trade-offs between toxicity and bright coloration,[34] and prey with strong secondary defenses have less to gain from costly signaling. Therefore, prey populations that are more toxic are predicted to manifest less bright signals, opposing the classical view that increased conspicuousness always evolves with increased toxicity.[35]

Aposematism

Skin toxicity evolved alongside bright coloration,[36] perhaps preceding it.[3] Toxicity may have relied on a shift in diet to alkaloid-rich arthropods,[23] which likely occurred at least four times among the dendrobatids.[23] Either aposematism and aerobic capacity preceded greater resource gathering, making it easier for frogs to go out and gather the ants and mites required for diet specialization, contrary to classical aposematic theory, which assumes that toxicity from diet arises before signaling. Alternatively, diet specialization preceded higher aerobic capacity, and aposematism evolved to allow dendrobatids to gather resources without predation.[8] Prey mobility could also explain the initial development of aposematic signaling. If prey have characteristics that make them more exposed to predators, such as when some dendrobatids shifted from nocturnal to diurnal behavior, then they have more reason to develop aposematism.[3] After the switch, the frogs had greater ecological opportunities, causing dietary specialization to arise. Thus, aposematism is not merely a signaling system, but a way for organisms to gain greater access to resources and increase their reproductive success.[37]

Other factors

Dietary conservatism (long-term neophobia) in predators could facilitate the evolution of warning coloration, if predators avoid novel morphs for a long enough period of time.[38] Another possibility is genetic drift, the so-called gradual-change hypothesis, which could strengthen weak pre-existing aposematism.[39]

Sexual selection may have played a role in the diversification of skin color and pattern in poison frogs.[40][41][42][43] With female preferences in play, male coloration could evolve rapidly. Sexual selection is influenced by many things. The parental investment may shed some light on the evolution of coloration in relation to female choice. In Oophaga pumilio, the female provides care for the offspring for several weeks whereas the males provides care for a few days, implying a strong female preference. Sexual selection increases phenotypic variation drastically. In populations of O. pumilio that participated in sexual selection, the phenotypic polymorphism was evident.[44] The lack of sexual dimorphism in some dendrobatid populations however suggests that sexual selection is not a valid explanation.[45]

Functional trade-offs are seen in poison frog defense mechanisms relating to toxin resistance. Poison dart frogs containing epibatidine have undergone a 3 amino acid mutation on receptors of the body, allowing the frog to be resistant to its own poison. Epibatidine-producing frogs have evolved poison resistance of body receptors independently three times. This target-site insensitivity to the potent toxin epibatidine on nicotinic acetylcholine receptors provides a toxin resistance while reducing the affinity of acetylcholine binding.[46]

Aggressive behavior and territoriality

The Dendrobatidae are a family of species very well known for their territorial and aggressive behavior not only as tadpoles, but as adults too. These aggression behaviors were not only limited to males, as many female Dendrobatidae also are known to defend their own native territory very aggressively.[48] These areas that were being defended aggressively by Dendrobatidae were typically found to be regions that served as male calling sites.[48] In fact, the males were seen wrestling with intruders of their territory in order to defend their calling sites as well as their vegetation.[48] The different ways in which Dendrobatidae defended their own territories included physical combat and aggression. While vocalization and various behavioral displays served as a way of exhibiting one's strength or fitness, territorial disputes and fights led to physical combat and aggression at times too.[48] Physical violence and aggression is particularly common at times of calling. If it was seen that an intruder was making calls in the territory of a Dendrobatidae frog then the resident frog would attempt to eliminate the competition to claim the territory and the females in it to himself.[48] The resident frog would initially try to make its presence known by the means of vocalization and various behavioral displays as a way to exert dominance.[48] If this did not scare away the intruder, then the resident frog would move towards the intruder and strike them.[48] This encounter would immediately escalate into a full on fight where both are striking each other and grasping each other's limbs.[48] Similarly, the females also often would get into fights and display aggressive behaviors in disputes over territory or a mating conflict. It was also observed that females who were going after the same male, after hearing their call, would chase each other down and wrestle to fight for the male.[49] After a female courts with a male, they are also very likely to exhibit aggressive behavior towards any females that approach that male.[49] Both the males and females bought their own respective sexes for each other in a fairly similar fashion.[49]

Reproduction

Ranitomeya imitator's developmental life stages

Many species of poison dart frogs are dedicated parents. Many poison dart frogs in the genera Oophaga and Ranitomeya carry their newly hatched tadpoles into the canopy; the tadpoles stick to the mucus on the backs of their parents. Once in the upper reaches of the rainforest trees, the parents deposit their young in the pools of water that accumulate in epiphytic plants, such as bromeliads. The tadpoles feed on invertebrates in their nursery, and their mother will even supplement their diet by depositing eggs into the water. Other poison frogs lay their eggs on the forest floor, hidden beneath the leaf litter. Poison frogs fertilize their eggs externally; the female lays a cluster of eggs and a male fertilizes them afterward, in the same manner as most fish. Poison frogs can often be observed clutching each other, similar to the manner most frogs copulate. However, these demonstrations are actually territorial wrestling matches. Both males and females frequently engage in disputes over territory. A male will fight for the most prominent roosts from which to broadcast his mating call; females fight over desirable nests, and even invade the nests of other females to devour competitor's eggs.[50]

The operational sex ratio in the poison dart frog family is mostly female biased. This leads to a few characteristic behaviors and traits found in organisms with an uneven sex ratio. In general, females have a choice of mate. In turn, males show brighter coloration, are territorial, and are aggressive toward other males. Females select mates based on coloration (mainly dorsal), calling perch location, and territory.[14]

Mating behavior

Observations of the Dendrobatidae family suggest that males of the species would typically make their mating call in morning between the times of 6:30 am to 11:30 am.[48] The calling would typically come from a place of elevation from various pieces of nature. The males would usually be on average one meter above the ground on limbs, trunks, and stems, or logs of trees so that their voice traveled further as well as the fact that it would help themselves be seen.[48] The calls were signaled towards the stream as the females typically were in that area.[48] Each male typically had their own region in which they only made calls from, and typically an individual would repeat their calls from the same spot during a mating season.[48] After the call is received, the female makes its way to the male, and fertilization occurred in a few instances.[48] This observed fertilization was not accomplished through amplexus.[48] Initiation and interaction during courtship typically were the result of active females rather than males.[49] The females stroked, climbed on, and jumped on the other in tactile courtship, and were by far the more active sex.[49] The duration of courtship in poison frogs is long and females could even reject males even after an entire day of active following which was found to occur in a few instances.[51] In the majority of cases, the males in fact chose the oviposition site and led the way and females usually followed the male to the site.[48] In some Dendrobatidae species, such as strawberry poison frog, visual cues under high light intensity were also used to identify individuals from the same population.[51] Different species use different cues to identify individuals from their same population during the time of mating and courtship.

Post-mating behavior

Typically in many species the larger portion of parental investment falls on the shoulders of the female sex, whereas the male sex has a much smaller portion.[49] However, it has been studied that in the family of Dendrobatidae, many of the species exhibit sex role reversal in which the females are competing for a limited number of males and the males are the choosers and their parental investment is much larger than the females.[49] This theory also says that the female will typically produce eggs at an exceedingly fast rate that the males cannot possibly take full care of them which then leads to some of the males becoming unreceptive.[49] Dendrobatidae also exhibit the parental quality hypothesis. This is where the females mating with the males try to ensure that their male mates with as few individuals as possible so that their number of offspring is limited, and thus each individual offspring receives a larger portion of care, attention, and resources.[49] However, this creates an interesting dynamic of balance as there is a limited number of males available, and with many females competing for a limited number of males for courtship this makes it difficult to limit the number of individuals a male mates with. Whereas in many species, the competition is flipped in that the competition is prominent among the males, among the Dendrobatidae it is the opposite as the females seem to have a great deal of competition among themselves for males. Females will even take the drastic measures and resort to the destroying of other female's eggs in order to make sure that the male they mated with is receptive and that it scares the male from mating with other females.[49]

Behavior as tadpoles

The poison dart frog is known for its aggressive and predatory behavior. As tadpoles, the individuals of the genus Dendrobates are said to exhibit some unique cannibalistic tendencies, along with many other forms of predatory behavior.[52] Dendrobates tadpoles that either consumed three or more conspecific tadpoles and/or relatively large larvae of a specific species of mosquito by the name of Trichoprosopon digitatum common in their environment led them to having a much higher growth rate and typically lived much longer lives.[52] Reasons for this behavior could be that predation and aggression was selected for and favored for a few reasons. One reason is to eliminate predators, and the second reason is that it serves as a source of food in habitats that were low in resources. This predation could have evolved over time and led to cannibalism as another form of predatory behavior that had benefitted individuals survival fitness.[52] However, one observation has been noted in the general characteristic of Dendrobates tadpoles including D. arboreus, D. granuliferus, D. lehmanni, D. occultator, D. pumilio, D. speciosus, and many other Dendrobates species is that they have reduced mouth parts as young tadpoles which limits their consumption typically to unfertilized eggs only.[52] Thus, it can be assumed that the cannibalistic tendencies of Dendrobates is limited to their lifetime as a tadpole and does not cross over into their adult life.

Captive female D. auratus.

All species of poison dart frogs are Neotropical in origin. Wild-caught specimens can maintain toxicity for some time (which they obtain through a form of bioaccumulation), so appropriate care should be taken when handling them.[53] While scientific study on the lifespan of poison dart frogs is scant, retagging frequencies indicate it can range from one to three years in the wild.[54] However, these frogs typically live for much longer than that in captivity, having been reported to live as long as 25 years. These claims also seem to be questionable, since many of the larger species take a year or more to mature, and Phyllobates species can take more than two years.

In captivity, most species thrive where the humidity is kept constant at 80 to 100% and where the temperature is around 72 °F (22 °C) to 80 °F (27 °C) during the day and no lower than 60 °F (16 °C) to 65 °F (18 °C) at night. Some species tolerate lower temperatures better than others.[citation needed ]

Media

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Most species of poison dart frogs are small, sometimes less than 1.5 cm (0.59 in) in adult length, although a few grow up to 6 cm (2.4 in) in length. They weigh 1 oz. on average.[7] Most poison dart frogs are brightly colored, displaying aposematic patterns to warn potential predators.

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Carnivorous piranhas often gathered together in large flocks Found in the Amazon River and many rivers in South America It has large triangular sharp teeth. has a large head There are strong muscles around the bulge of the cheeks. It is used to eat the flesh of animals that have fallen near their habitat. especially the panicked animals. or is in a weak, injured state The sound of rumbling water will quickly attract piranhas The piranhas use their sharp teeth to devour the flesh of large animals until they reach the spine in just a few minutes. The ferocity of piranhas varies from species to species, but all piranhas

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Bull shark, the predator that has reappeared in the media. After the attack on the boy in Satun
Although scientists have identified more than 500 shark species found on Earth, only three have been reported to harm humans: the great white shark (Carcharodon carcharias), the tiger shark (Galeocerdo cuvier), and the bull shark (Carcharhinus leucas). In biology, according to experts on bull sharks. It is considered the most dangerous shark. Due to the habitats along the coast at a depth of about 30 meters, which can easily meet with humans

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The panthers had very high speeds in the forest, if they encountered them the chances of surviving were very small because of their extremely fast speed.

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when talking about sharks The average person has a picture of a shark in their minds as a ferocious and terrifying sea creature, but in the real world people are bitten by dogs tens of thousands of times more often than sharks. In the wild, tigers are 20 times more deadly than marine sharks. About 25 people are bitten by sharks each year, although the statistics of shark stings in each country are unknown. But in America, a survey found that in 1998 people were attacked by sharks 54 times, in 1999 there were 58 times and in 2000 there were 79 times. The reason why people are more bullied by sharks is because the sea has

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Lions are one of the most dangerous animals on the planet. They are particularly aggressive and dangerous to humans when protecting the cubs, territory, or carcasses that they have hunted. Lions are responsible for about 200 human deaths per year, which puts them in the top 10 most deadly wild animals.

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Stonefish are masters of camouflage and can blend in so perfectly with their surroundings that their prey, predators, and even human SCUBA divers have trouble seeing them at all. They almost always sit perfectly still, on the sea floor, in their preferred habitat of coral and rocky reefs, and their colors are often a perfect match for the substrate. Some individuals have even been observed with algae growing on them. While this camouflage gives them further protection from predators, its primary purpose is to allow stonefish to ambush their prey. They eat other reef fishes and some bottom dwelling invertebrates, but they do not actively pursue these animals. Instead, they wait for dinner to come to them. Waiting for hours at a time, stonefish strike when their potential prey is less than their body length away. Their powerful jaws and large mouths create so much pressure that they are easily able to suck down their unsuspecting prey and swallow it whole.

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There are reports and one painting (now lost) of pure black non-striped tigers (true melanistictigers). Most black mammals are due to the non-agouti mutation. Agouti refers to the ticking of each individual hair. In certain light, the pattern still shows up because the background color is less dense than the colour of the markings.

So-called black tigers are due to pseudo-melanism. Pseudo-melanistic tigers have thick stripes so close together that the tawny background is barely visible between stripes.[1] Pseudo-melanistic tigers exist and can be seen in the wild and in zoos.[1] Such tigers are said to be getting more common due to inbreeding. They are also said to be smaller than normal tigers, perhaps also due to inbreeding or because large black leopards are misidentified as black tigers.

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Its poison can damage the nervous system. If you get bitten You will be in immense pain. It was then followed by a fever, paralysis, and eventually death. But even if the poison is very serious But it cannot kill an adult human. But it would be extremely dangerous for children, babies, and the elderly, although it could not kill an adult. But it can cause paralysis.

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Stone fish. If competing in beauty, the stone fish seems to lose overwhelmingly. But if the competition is about the severity of the poison, then The stone fish is definitely second to none. It is known as the most poisonous fish in the world. The venom of this stonefish resides in its thorns. It's said that if you stab it, You will taste the pain that a human being can ever hurt. In addition to being extremely painful It will paralyze you. and eventually die

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chubby fort The head is round, obtuse, large. The second dorsal fin is an obtuse triangular dorsal fin. ferocious It eats fish and other aquatic animals as food. as well as may injure humans as well They live in tropical and temperate seas around the world. especially the coastal area Mature size up to 3.5 meters, weight up to 316.5 kg.Bull shark Is a type of shark that can adapt to live in fresh water. It is sometimes found in large rivers hundreds of kilometers from the sea, such as the Mississippi River, the Amazon River, the Sambic River, the Tigris River, the Yangtze River, and Lake Nicaragua. In Thailand, such as the Mekong River, Mae Klong River, Salween River, etc.[3], the fish will swim in from the sea. It is reported that the most distant from the sea is the Amazon River in South America. Found 2,200 miles from the sea[4]

By.

Wongsapat Sanokham No.41,kittiphat Apamorakang No.2

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The fastest animal in the world is a leopard.  It reaches a speed of 110-120km/h, a terrifying speed, it bites and chews its sharp claws that can value you in the blink of an eye.  If you do find it, don't run, swell up to intimidate and slowly back away, but we don't have to worry too much about it. Leopard swarms are common in Africa, South Asia, and East Asia.  to the southern part of Thailand, Malaysia and the Java Islands  But don't despair, not all tigers are hungry and ready to hunt.  if you have enough luck

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Phoneutria is a genus of spiders in the Ctenidae family that are medically important to humans. They are mostly found in northern North America. with one species in Central America Members of the genus are often referred to as Brazilian wandering spiders. The poison is very serious If bitten you must go to the hospital immediately. Otherwise it may die.

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Great white sharks are the largest and most famous predatory fish in the world. This shark species can weigh up to 1111.3 kg, and to make matters worse, it can be found in seas around the world. But it will emerge in the warm waters of North and South America. and Western Australia The great white shark has sharp, sharp teeth shaped like the tip of an arrow. It uses these dangerous teeth to slash the meat and tear it into large pieces before swallowing it without chewing.

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The tarantula has poisonous fangs and is agile. and release a fiber that looks like a spine fear of tarantulas So it's not unreasonable. but if it is bitten Its venom is no worse than a bee sting. "I will tell those who are afraid of spiders, Let's talk about it with others because it affects people's lives. is an unreasonable fear."

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The deathstalker (Leiurus quinquestriatus) is a species of scorpion, a member of the family Buthidae. It is also known as the Palestine yellow scorpion, Omdurman scorpion, Naqab desert scorpion and by many other colloquial names, which generally originate from the commercial captive trade of the animal.

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Depending on the type of scorpion, the venom can cause pain or, much more rarely, affect your nervous system and cause other serious health problems. These issues can include heart, breathing, and muscle problems. It's important to get immediate medical help if you have severe symptoms after a scorpion sting.

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which number around 900,000 in the wild, are a relatively mild species when left alone, preferring to travel in massive herds as they graze in early morning and late afternoon hours, or gather around watering holes. However, if an individual (or its calf) is threatened or wounded, they become the incarnation of their nickname: Black Death. Reportedly responsible for killing more hunters on the African continent than any other creature, these behemoths, which can grow up to nearly six feet tall and weigh close to a ton, circle and stalk their prey before charging at speeds of up to 35 miles per hour. They’re even known to continue charging when injured, and will not hesitate to attack moving vehicles. Suffice to say, you don’t want to mess with those horns.

Where to find them: The Sub-Saharan Africa, including the Maasai Mara in Kenya, is home to

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One foot has a bite force of 1,000 pounds, which is the third largest bite force in the world after saltwater crocodiles and hyenas. only And when bitten, the jaw will be locked to prevent the struggle from falling off. Until experts in turtle capture Alligator said. If bitten by an alligator turtle The only way to remove it is to cut off the head and insert a stick through the nostrils through the throat. to unlock the jaw

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The golden poison frog is considered one of the most toxic animals on Earth. A single specimen measuring two inches has enough venom to kill ten grown men. The indigenous Emberá people of Colombia have used its powerful venom for centuries to tip their blowgun darts when hunting

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Tiger is a mammal in the Philidi family, which is the same family as the cat. The species known as tigers tends to have a somewhat larger body and live in the forest. The body size is about 168 - 227 centimeters and weighs about 180 - 245 kilograms. Round pupils are a group of carnivores. They have a unique appearance and shape as well as behavior. different from other groups of animals nocturnal native to the forest Most tigers still have the ability to climb trees. which except the cheetah All tigers have short jaws.

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Killer whales are the top predators, they eat about 227 kg/day and they never sleep. But instead, swim slowly, or it will drown. Older killer whales teach younger killer whales how to prey.

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Twenty minutes after being bitten you may be lose the ability to talk. After one hour you're probably comatose, and by six hours, without an antidote, you are dead

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Grizzly bears are one of the largest species of bears in the world that still exist today. It is also considered to be one of the largest carnivores in the world. except during the breeding season or during a baby or during food shortages which bears are very fierce and can invade and kill the invaders except for human beings.

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Africa slender-snouted crocodile can grown up to 13 feet long and weight up to 500 pound their skin is protected by scales and their back scales are armored with bony plates. They have row razor-sharp teeth in powerful jaws. They swim with their tails. They live at South American

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Puffer fish may contain the potent and deadly toxins tetrodotoxin and/or saxitoxin which can cause severe illness and death. These are central nervous system toxins and are more deadly than cyanide. Symptoms start within 20 minutes to 2 hours after eating the toxic fish.

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Puffer fish may contain the potent and deadly toxins tetrodotoxin and/or saxitoxin which can cause severe illness and death. These are central nervous system toxins and are more deadly than cyanide. Symptoms start within 20 minutes to 2 hours after eating the toxic fish.

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The King cobra, one of the most dangerous animals that can be found in thailand. You probably found one in your backyard at one point! The could also be found in jungles hanging on trees. It's color easily blends itself into the environment.
It usually eats mouses birds and small animals. Something it goes for other animals like chickens or even cats.
The poison from these things are so incredible dangerous it killed a man in only 30 minutes. If the poison didn't kill you yet. you would have to try to break free from it wrapping around your body, good luck with that! You'de have to watch your step the next time you walk into a bush or under a tree. These things could litterally be found anywhere in thailand.

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The saltwater crocodile is a large and opportunistic hypercarnivorous apex predator. It ambushes most of its prey and then drowns or swallows it whole. It is capable of prevailing over almost any animal that enters its territory, including other apex predators such as sharks, varieties of freshwater and saltwater fish including pelagic species, invertebrates such as crustaceans, various reptiles, birds and mammals, including humans.

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When you get snatched only once you too can die.The king cobra is a member of the vertebrate phylum. Reptile class a large venomous snake The average length is generally 3.5–4.5 m and is considered the longest venomous snake in the world. The world record length is 5.59 m.

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ดาวน์โหลด (1)

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Surprisingly enough, the next deadliest animal on our ranking is none other than the freshwater snail. Much like the other less overtly threatening species that we have mentioned, it is not the snail that directly kills humans but the disease that they transmit. According to World Health Organization estimates, several million people are diagnosed with a parasitic infection called schistosomiasis every year and somewhere between 20,000 and 200,000 of those cases are fatal.

Schistosomiasis causes severe abdominal pain and blood in the urine of the infected, but it is not generally fatal outside of developing countries. The wide range in possible deaths is the result of spotty governmental reporting and the lack of medical care in these remote areas and underdeveloped nations.

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It can cause other systemic symptoms such as nausea, vomiting, fever or headache. In some cases it can be very severe, such as kidney failure or atherosclerosis.

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Honey badgers are animals that The worst resides in Africa and Southwest Asia It lives underground as a family of 20. It is agile, intelligent (can invent tools such as ladders), has sharp fangs, thick skins, making it a brave animal. Its food is small to large, whether it is small animals such as termites, rabbits, hedgehogs, snakes.

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Honey badgers are animals that The worst resides in Africa and Southwest Asia It lives underground as a family of 20. It is agile, intelligent (can invent tools such as ladders), has sharp fangs, thick skins, making it a brave animal. Its food is small to large, whether it is small animals such as termites, rabbits, hedgehogs, snakes.

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The blue-ringed octopus has a very deadly venom in its saliva. This is 20 times more deadly than a cobra. The bitten person dies in a few minutes, killing 26 people at once. It is considered one of the most venomous aquatic animals in the world.

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Overseas Taipan Snake Overseas Taipan It is the most venomous snake in the world. Its poison can kill 100 people, and in just 45 minutes!

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poison dart frogs are diurnal, meaning they're most active in the daytime – just like us humans. This is quite rare for frogs, as most species are nocturnal. Poison dart frogs are among the most poisonous amphibians in the world. However, they don't use this as a means of attack.

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Mosquitoes take people's blood and They also give malaria to people .