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One of the scariest predators to have lived on Earth was the tyrannosaurus rex. This well-known carnivore ruled the forested river valleys of western North America 68 million years ago during the late Cretaceous period. It had a massive body, sharp teeth, and jaws so powerful they could crush a car.

Behavior

T-Rex could only consume meat. It had an incredible sense of smell, which it used to sniff out potential target, and it could detect movement from great distances. The T-Rex could run up to 20 mph when it saw the target and used its strong legs to rush towards it.

Overall

In conclusion, Tyrannosaurus Rex was one of the most amazing animals to have ever lived on Earth. While there are still many unknowns about the behavior and intelligence of T-Rex.

Yasahwin Yogeswaran

4 Cheng Ho

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Carnotaurus was a fascinating dinosaur that lived during the Late Cretaceous period, about 70 million years ago. It was a theropod, meaning it was a bipedal carnivorous dinosaur, and is particularly well-known for its distinct appearance. Here are some key details:

Physical Characteristics:

Size: Carnotaurus was about 8 to 9 meters (26 to 30 feet) long and weighed around 1.5 to 2.1 tons.

Head and Horns:It had a short, deep skull with two prominent horns above its eyes, giving it a very distinctive and somewhat menacing look. These horns are thought to have been used either in combat with other Carnotaurus or for display purposes.

Teeth: Its teeth were small, compared to other large theropods, and more adapted for tearing flesh rather than crushing bone.

Arms:Carnotaurus had remarkably small arms, even smaller than those of a T. rex. Its arms were so short that they were almost useless, and their exact function remains a mystery.

Legs: It had long, powerful legs, which suggest that it was likely a fast runner, possibly one of the fastest large theropods, capable of chasing down prey.

Behavior and Diet:

Diet: Carnotaurus was a carnivore and likely preyed on smaller dinosaurs, or possibly scavenged. Its strong jaws and sharp teeth were well-suited for a meat-based diet.

Hunting Strategy:It may have used ambush tactics to catch prey, relying on its speed and the element of surprise.

Habitat:

Location: Fossils of Carnotaurus have been found in South America, particularly in Argentina. This area was part of a larger landmass called Gondwana during the Late Cretaceous period.

Environment:It lived in a relatively dry, open environment, possibly hunting in savannah-like areas.

Fossil Discovery:

First Discovery: The first and so far only specimen of Carnotaurus was discovered in 1984 by the Argentine paleontologist José Bonaparte in the La Colonia Formation of Argentina.

Preservation The skeleton is one of the best-preserved theropod skeletons ever found, with even some skin impressions being preserved. These impressions suggest that Carnotaurus had small, bumpy scales covering its body, possibly with larger scales along its back.

Unique Features:

Speed: As one of the faster theropods, Carnotaurus might have relied heavily on its speed to catch prey.

Horns: The horns above its eyes are one of the most distinctive features of Carnotaurus, setting it apart from other theropods. Their purpose is still debated, but they may have been used in head-butting contests or as a visual signal.

Carnotaurus is a prime example of the incredible diversity of dinosaur life during the Cretaceous period and remains one of the most unique and recognizable dinosaurs discovered to date.

Srelakshanaa

4mp

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Introduction

VELOCIRAPTOR lived in what's now called the Gobi Desert in Mongolia, it's one of the few places on Earth that has nearly the same habitat now as did during the time of dinosaurs. In addition to larger dinos, this small carnivore likely also snacked on little lizard, dino eggs and baby dinosaur.

Where and when did the VELOCIRAPTOR lived?

Velociraptor sickle-clawed dinosaur

that flourished in central and eastern Asia during the Late Cretaceous Period

(99 million to 65 million years ago). It is closely related to North American Deinonychus of the Early Cretaceous in that both reptiles were dromaeosaurs.

Physical Features

It was a bipedal, feathered carnivore with long tail and enlarged sickle-shaped claw on each hindfoot, which is though to have been used to tackle and restrain prey.

BEHAVIOUR

It was primarily an ambush predator and leaped upon its prey in a surprise attack from behind the cover of vegetation.

From

Ghuhan Esvaran

4 Cheng ho

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Elasmosaurus was a plesiosaur from the Late Cretaceous period, known for its extremely long neck and sharp, small teeth. It used its long neck and sharp teeth to catch small fish and squid in the ocean.

WHERE AND WHEN DID ELASMOSAURUS LIVED?

Elasmosaurus lived around 80 to 70 million years ago. Fossils have been found mainly in North America, including the United States and Canada.

PHYSICAL FEATURE

Elasmosaurus had a remarkably long neck that made up about half of its total body length, a small head, and sharp teeth suited for catching small fish and squid. Its flipper-like limbs provided stability and maneuverability in the water, while its streamlined body design helped it swim efficiently through its marine environment.

BEHAVIOR

The behavior of Elasmosaurus involved using its long neck to catch small fish and squid , while swimming slowly and gracefully through the water.

From: Yui Han 4 Cheng Ho

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The most commonly displayed dinosaur in museums is Diplodocus. This dinosaur was longer than a tennis court and is the longest complete dinosaur that scientists have discovered. The name Diplodocus means “double beam.” This name comes from a special feature of its tail bones. Diplodocusbelongs to a group of enormous dinosaurs called sauropods. The sauropods were large, plant-eating dinosaurs with long necks, massive bodies, and four pillar like legs to help the body.Diplodocus lived about 159 to 144 million years ago during a period of the Earth’s history called the Jurassic. Remains of this dinosaur have been found in North America, especially in Colorado, Montana, Utah, and Wyoming. Diplodocus lived in meadows where plants grew thick and at the edges of forests and other areas where many trees grew.

Physical features

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Scientists refer to Diplodocus as a walking suspension bridge. Its four legs were built like supporting pillars, and its spine held up its body, just as a bridge with cables holds up a road. Diplodocus measured up to 90 feet (27 meters) long and stood about 15 feet (4.6 meters) tall at the hips. A lightweight among the sauropod dinosaurs, Diplodocus weighed only about 30 tons. The unique, hollow structure of its backbones helped this animal to be so light. It had a long neck and a very long tail. Diplodocushad a small, horselike head and a very small brain. It had peg-shaped teeth in the front of its mouth. Its back legs were slightly longer than its front legs, making the animal slope downward from its hips to its head. Diplodocus had elephantlike feet with three claws on each back foot. One section of its tail bones featured a pair of anvil-shaped projections on the underside of each bone in that section. Scientists believe that these bones served as protection for the blood vessels and tissues of the tail. These are the “double beams” for which the dinosaur is named. Scientists once thought that Diplodocus dragged its tail along the ground. They now agree that this dinosaur held its tail high off the ground. It may have used its tail as a whip in self-defense.

Behavior

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Diplodocus was a plant eater. It may have fed on low-lying ferns, though its long neck also allowed it to browse the tops of trees. Some scientists think that Diplodocus actually stood up on its back legs to reach the treetops. Its specially designed tail with the “double beam” bones may have acted as an extra leg for the animal to lean back on. Diplodocushad no back teeth to chew with, so it swallowed small stones to help grind up the plants in its stomach. Diplodocus lived and traveled in herds. It reproduced by l eggs

four pillarlike legs to support the body

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Introduction

Pteranodon, (genus Pteranodon), flying reptile (pterosaur) found as fossils in North American deposits dating from about 90 million to 100 million years ago during the Late Cretaceous Period. Pteranodon had a wingspan of 7 metres (23 feet) or more, and its toothless jaws were very long and pelican-like.

When and Where Pteranodon Lived?

Pteranodon lived about 90 million to 100 million years ago, during a time called the Late Cretaceous Period. Most Pteranodon fossils have been found in North America, mainly in Kansas, Alabama, Nebraska, Wyoming, and South Dakota.

Physical Feature

Pteranodon had a small body, compared with the large size of its wings and head. Its wingspan was at least 23 feet (7 meters). Its head had a massive crest at the back of the skull. The crest may have counterbalanced the reptile's huge, toothless jaws.

Behavior

Behavior. The Pteranodon is skittish and not aggressive whatsoever, and will fly away when attacked. However, if an egg is stolen from a Pteranodon, it will become aggressive with an average aggravation range.

From: Qian Roo ( 4mp)

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Diplodocus was herbivorous, meaning it only ate plants. Its narrow teeth were arranged like a rake, which helped them strip leaves from gingko and conifer trees. Diplodocus would have had to eat all day to be able to survive on just leaves.Diplodocus was probably a medium-level browser, which would have prevented competition with shorter Stegosaurs and taller Sauropods. Adult Diplodocus might have been too large for predators such as Allosaurus. However, carnivores like Allosaurus could probably pose a threat to younger individuals

From : Shamira<3

Class:4mp

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Pterosaurs (/ˈtɛrəsɔːr, ˈtɛroʊ-/;[5][6] from Greek pteron and sauros, meaning "wing lizard")[7] are an extinct clade of flying reptiles in the order Pterosauria. They existed during most of the Mesozoic: from the Late Triassic to the end of the Cretaceous (228 to 66 million years ago).[8] Pterosaurs are the earliest vertebrates known to have evolved powered flight. Their wings were formed by a membrane of skin, muscle, and other tissues stretching from the ankles to a dramatically lengthened fourth finger.[9].

From anakin 4mp

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An incisivosaurus are the most unique dinosaurs on land it is one of the teropod dinosaurs from the early Cretaceous Period of what is now the people's republic of China.

It is the most unusual theropod, they eat seeds like other oviraptorosaurs or even meat from other theropods, but I was actually a herbivore.

They lived 129-122 million years ago during the Cretaceous era, in what is now known as the Yixian Formation in northeastern China.

Incisivosauruses have been estimated to be 0.8-1 meter / 2.6-3.3 feet high. A incisivosauruses weight about 2-4.6kg and 4.4-10 ibs.

Incisivosauruses behave very independently has some limited credibility and once added together.

(From JooYang 4ch)

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Introduction

Giganotosaurus is the largest known terrestrial carnivore. It lived 99.6 - 93.5 million years ago

Where and when did Giganotosaurus lived?

Giganotosaurus lived during the Cenomanian period ( 99.6 - 93.5 million years ago). It lived in the Swampy Lowlands with rivers and streams.

Features

The Giganotosaurus had a large head with a blunted chin, dozens of serrated teeth that grew to 20cm (about 8 inches).It had two small arms and two long legs. It weight about 4,200kg - 14,000kg.

Behavior

Giganotosaurus always roamed and hunted in packs for food. It was known to be an aggressive creature. It was fast and more agile.

From:Thejashri

4cheng ho

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Where it came from:

The plesiosaur first appeared during the Triassic period about 203 million years ago they became common during the Jurassic period and breathed with air.

It’s body

The plesiosaur had a broad flat body and a short tail their limbs involved four long flippers which was powered by strong muscles attached to flat bony plates.

How and when did it die

the plesiosaur died due to a massive meteorite smashing into the earth it died about sixty six million years ago.

How it swam

The plesiosaur swam in an unusual way their front and hind legs evolved to become four winged like flippers over time.

From:Chan Evan

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A 40-foot-long predator stomps through a forested valley in what’s now western North America, following its nose: The animal sniffs a tasty Triceratops nearby. Moving quickly—about 12 miles an hour—the carnivore catches up to its prey. With one powerful bite, it rips off a hundred pounds of meat. Then it throws its head back, tosses the flesh 15 feet into the air, and catches it to swallow it whole.

Brainy beast

Other species of tyrannosaurs existed for a hundred million years before T. rex appeared, but these dinos were puny compared to other giant predators at the time, like allosaurs, ceratosaurs, and spinosaurs. (The smallest tyrannosaur, Dilong, was only about five feet long and weighed about 11 pounds.) But Tyrannosaurus rex was one of the fiercest predators of all time.

T. rex had a massive body; a mouth full of 60 eight-inch-long, supersharp teeth; and the strongest bite of any land animal—ever. Its jaws could have crushed a car. Even more fearsome? T. rex had a brain about twice as large as other dinosaur noodles, suggesting that it might have been more intelligent, with better vision and sense of smell, than its fellow dinosaurs.

Its name comes from the Greek words meaning “tyrant lizard king.” This “king” ruled over what’s now North America and Asia some 68 million years ago, during the Cretaceous period. But T. rex was no match for the giant asteroid that slammed into Earth 66 million years ago, causing the extinction of the dinosaurs.

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Stegosaurus is a distinctive herbivorous dinosaur from the Late Jurassic period, around 155 to 150 million years ago. Recognizable by its double row of large, bony plates along its back and the spiked tail known as the thagomizer, Stegosaurus was a relatively slow-moving dinosaur with a small head compared to its massive body. Its unique features likely served as defense mechanisms against predators and possibly for temperature regulation.

Where and when did the

Stegosourus lived?

Stegosaurus lived during the Late Jurassic period, approximately 155 to 150 million years ago. Its fossils have been predominantly discovered in what is now North America, particularly in the western United States. Key fossil sites include areas in Colorado, Utah, and Wyoming. During this time, the region was characterized by a mix of lush vegetation and varied terrain, including river systems and floodplains, providing a suitable environment for the herbivorous Stegosaurus. The dinosaur roamed in a diverse ecosystem alongside other Jurassic species, such as theropod predators and various plant-eating dinosaurs.

Physical Features

Stegosaurus is distinguished by its remarkable physical features, which made it one of the most recognizable dinosaurs from the Late Jurassic period. Its most notable feature is the series of large, bony plates that ran along its back in two rows, extending from its neck to the base of its tail. These plates were embedded in the skin and likely served multiple functions, including defense against predators, display for social interactions or mating rituals, and possibly thermoregulation by helping to absorb or dissipate heat. The tail of Stegosaurus was equipped with four sharp spikes known as the thagomizer, which were effective for warding off predators. Additionally, Stegosaurus had a relatively small head compared to its large, bulky body, supported by a short, sturdy neck. Its limbs were robust, with the hind legs being longer than the front legs, contributing to its quadrupedal stance. This combination of features allowed Stegosaurus to navigate its environment effectively while providing defense mechanisms and contributing to its distinctive appearance.

Behavior

Stegosaurus was primarily a herbivore, feeding on low-lying vegetation such as ferns and cycads, which it could reach with its small head and specialized teeth. Its distinctive features, including the large bony plates along its back and the spiked tail known as the thagomizer, indicate a strong emphasis on defense rather than aggression. These plates might have served multiple purposes, including defense against predators, display for mating rituals or social interactions, and possibly thermoregulation by absorbing or dissipating heat. The relatively slow-moving Stegosaurus, with its robust and heavily built body, likely relied on these defensive adaptations to protect itself from predators. It is also believed to have lived in herds, which would have provided added protection and facilitated social interactions within its group.

From:

Ar-Raees

4MarcoPolo

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Tyrannosaurus rex was one of the most ferocious predators to ever walk the Earth. With a massive body, sharp teeth, and jaws so powerful they could crush a car.

Common Name:Tyrannosaurus rex

Scientific Name: Tyrannosaurus rex

Type: Prehistoric Animals

Diet:Carnivore

Size:40 feet long and 12 feet tall

Weight:Between 5.5 and eight tons.

Not the Biggest Meat-Eating Dinosaur

Most people assume that the North American Tyrannosaurus rex—at 40 feet from head to tail and seven to nine tons—was the biggest carnivorous dinosaur that ever lived. T. rex

Very Bad Breath

The dinosaurs of the Mesozoic Era obviously didn't brush their teeth or floss. Some experts think shards of rotten, bacteria-infested meat constantly lodged in its closely packed teeth gave Tyrannosaurus rex a "septic bite," which infected and eventually killed its wounded prey.

Lived About 30 Years

t's difficult to infer a dinosaur's life span from its fossils, but based on analysis of existing specimens, paleontologists speculate that Tyrannosaurus rex may have lived as long as 30 years. Because this dinosaur was atop the food chain, it would most likely have died from old age, disease, or hunger rather than attacks by fellow theropods, except when it was young and vulnerable.

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Spinosaurus means "spine lizard,'' an appropriate describer, as the huge dinosaur had a big fin which is a sail to swim fast in the water. the distinctive tail allowed the dinosaur to swim very fast in the water. The size of the tail is approximately 7 feet which is 2.1 meters long and most likely

connected to the skin of the dinosaur.

Where and when did the Spinosaurus lived?

the Spinosaurus lived in North Africa's Sahara region. It inhabits what is now North Africa's Sahara region, which has the longest river in Africa. like I said in the top it allows the dinosaur to have basic needs like food, water and more. the nostrils was further up on its snout making the dinosaur nostrils further up behind its snout. The Spinosaurus lived between 99 and 93.5 million years ago in the Cretaceous Period.

Physical Features

The Spinosaurus, which was slightly longer than the Tyrannosaurus-Rex. Isn't that impressive? It is known as the largest carnivorous animal in the whole world! Its skull is approximately 1.70-1.75 meters. in feet it is almost 5-6 feet.

The length of the Spinosaurus is like 14-20 meters and in feet it is 49-60 feet. The weight of the Spinosaurus is like almost 30 African elephant which is 12,000-16,000 kg

(12-22 metric tons)

Behavior

The Spinosaurus is unique but its behavior is more unique.

Spinosaurus behavior is a lot more different than other aquatic on land and in water because they have four limbs but always use its back limbs, but we do not know why it uses its back legs

Samuel :) 4CH

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Argentinosaurus is a genus of giant sauropod dinosaur that lived during the Late Cretaceous period, approximately 94 to 97 million years ago, in what is now Argentina. It is one of the largest known land animals that ever existed.

Here are some key features and facts about Argentinosaurus:

1. Size: Estimates suggest that Argentinosaurus could reach lengths of up to 30-40 meters (98-131 feet) and weigh as much as 70-100 tons.

2. Appearance: Like other sauropods, Argentinosaurus had a long neck and tail, a large body, and four sturdy, pillar-like legs. Its long neck allowed it to reach high vegetation, while its massive size likely helped protect it from predators.

3. Discovery: The first fossils of Argentinosaurus were discovered in the early 1990s in Argentina. The genus name means "Argentine lizard," in reference to its country of origin.

4. Diet: As a herbivore, Argentinosaurus would have fed on large quantities of plants, including ferns, cycads, and conifers.

5. Reproduction: Like other dinosaurs, Argentinosaurus would have laid eggs. However, much about its reproduction and life cycle remains speculative due to limited fossil evidence.

6. Significance: Argentinosaurus is often highlighted in discussions about dinosaur gigantism and the biological limits of body size in terrestrial animals. Its discovery has provided significant insights into the ecology and evolution of sauropods.

YOGENDRA RAYEN

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Introduction

Carnotaurus means “meat-eating bull” and its scientific name is Carnotaurus sastrei. Its genus is Carnotaurus; Bonaparte, 1985.

When and where Carnotaurus lived?

Carnotaurus lived during the Maastrichtian period in the late Cretaceous period (72 million years ago) in what currently is Patagonia and Argentina. By the time Carnotaurus envolved, other meat-eaters were smaller, only a few hundred pounds or less, making Carnotaurus the largest carnivore in their ecosystem.

Physical feature

Carnotaurus was a meat-eating with two horns on the top of its head and very small arms. It had an unusually short snout and its head was very narrow when viewed from front. Scientists have found lots of skin impressions for this dinosaur, so we know that it had scales over much of its body.

Behavior

Carnotaurus shared its territory with the prehistoric turtles, snakes and several species. They were extremely threatening predators and were able to gulp down some of its prey’s whole. These creatures were also one of the fastest predators of the Mesozoic Era.

From,Caitlin(4 Cheng Ho)

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Introduction:

Tyrannosaurus is a genus of large theropod dinosaur. The type species Tyrannosaurus rex (rex meaning "king" in Latin), often shortened to T. rex or colloquially T-Rex, is one of the best represented theropods.

When and where T-Rex live?

T-Rex lived about 66–68 million years ago during the Cretaceous Period in the western United States, including Montana and Wyoming.

Physical Feature:

The animal's length was about 40 feet (12 meters). Height was 15 to 20 feet (4.6 to 6 meters). Weight could top 9 tons (8,200 kilograms).

Tyrannosaurus had a massive 5-foot-long (1.5 meters) thick skull and its 4-foot-long (1.2 meters) jaw could easily crush bones. Serrated, conical teeth were most likely used to pierce and grip flesh.Its strong thighs and long, powerful tail helped T-Rex move quickly. The animal was able to run at speeds of up to 15 mph (24 kph).

Behaviour:

T-Rex ate mostly meat. Its favorite meals were probably herbivorous dinosaurs including Edmontosaurus and Triceratops. Tyrannosaurs were social animals that lived in groups. Based on tyrannosaur footprints and associated fossil remains of their meals, tyrannosaurs likely engaged in cooperative pack hunting, in which multiple animals work together to bring down prey.

Mathev Sharma 4MP

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Introduction:

The Ankylosaurus lived 70 million to 66 million years ago in North America. It's height was about 10 meters (33 feet) and it probable weight about 4 tons. It's head was square and flat and was broader that it was long. It's teeth looked similar like a Stegosaurus's teeth. The body was short and squat, with massive legs to support it's weight. Like other Ankylosaurus, it's back and flanks were protected from attack by thick bands of armour consisting of flat bony plates. These plates were supplemented by rows of bony spikes projecting from the animal's flanks and by bony knobs on it's back. The skull was also heavily armoured and spiked. Ankylosaurus's long tail terminated in a thick "club" of bone, which it probably swung as a defense against predators. This club was formed by the last tail vertebrate which were nested tightly against each other and a sheath of several bony plates. The armour schemes of other Ankylosaurus varied somewhat, but all were well protected against attack by carnivorous dinosaurs. The earliest Ankylosaurus called Nodosaurs, lacked the tail club and had rather different armour patterns.

FROM:

KENISHA (4 MARCO POLO)

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Indroduction

Spinosaurus means "spine lizard," an appropriate descriptor, as the dinosaur had very long spines growing on its back to form what is referred to as a "sail." The distinctive spines, which grew out of the animal's back vertebrae, were up to 7 feet (2.1 meters) long and were likely connected to one another by skin.

Where and when Spinosaurus lived?

North Africa's Sahara region.

It inhabited what is now North Africa's Sahara region, which at the time featured a large river system. Spinosaurus was well adapted for aquatic life. Its nostrils were further up on its snout than the nostrils of other dinosaurs. Spinosaurus lived between 99 and 93.5 million years ago in the Late Cretaceous Period.

Physical feature

Spinosaurus, which was longer and heavier than Tyrannosaurus, is the largest known carnivorous dinosaur. It possessed a skull 1.75 metres (roughly 6 feet) long, a body length of 14–18 metres (46–59 feet), and an estimated mass of 12,000–20,000 kg (13–22 tons)

Behavior

The Spinosaurus behavior is unique and different from other aquatic animals in the land animals. Even though they have four limbs, they usually walk on the back limbs. It uses a bipedal condition and has an occasional crouching posture. The entire family of theropods cannot rotate its forearms.

FROM: LAKSSHAAN GUNASEGAR

(4 MARCO POLO)

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Introduction:

The dinosaur known as Dilophosaurus was one of the loudest dinosaur. It had double crests on top of his head and two small arms and legs. The name Dilophosaurus means ''double-crested lizard'' in Greek. It also had a tail that is much more bigger than a Golden Retriever.

When and where Dilophosaurus lived?

Dilophosaurus lived about 193 to 183 million years ago. It also live during the Early Jurassic period. The Fossils of Dilophosaurus had been found in Arizona in the Kayenta Formation.

Physical features:

Dilophosaurus weighed up to 400 to 500 kilograms and reached a lenght of nearly 6 to 10 feet (2 to 3 meters) long. The double crests on Dilophosaurus head was long and curved.

Behaviour:

Dilophosaurs is a meat eater. It will open his big frills and spit venom at the side of the head when it scream. The double crests on the top of the head is to recognise the species and sexual selection. Dilophosaurus can turn aggressive quickly and can run really fast.

From:LAVIN

(4 cheng ho)

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INTRODUCTION: Velociraptor

The word Velociraptor combines the Latin Velox ,"swift," and raptor, "robber or plunderer." A Velociraptor a was a meat eating animal.

WHEN AND WHERE A VELOCIRAPTOR LIVED:

The Velociraptor was very famous for piercing pinning down prey as hawks do. Velociraptors lived in what's now called the Gobi Desert in Mongolia.

PHYSICAL REATURES:

The physical features or a Velociraptor is it's sleek body was lightweight and built for speed, making it an effective predator. It's head was long and narrow, and it had fairly large brains.

BEHAVIOUR:

The Velociraptor was a carnivores dinosaur that only ate meat. A Velociraptor was primarily an ambush predator and leaped upon its prey in a surprise attack from behind the cover of vegetation.

FROM:(ASHWIN)

CLASS:(4CENG HO)

RATING:(10/10 STARS)

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Spinosaurus, genus of theropod dinosaurs belonging to the family Spinosauridae, known from incomplete North African fossils that date to Cenomanian times (roughly 100 to 94 million years ago). Spinosaurus, or “spined reptile,” was named for its “sail back” feature, created by tall vertebral spines. It was named by German paleontologist Ernst Stromer in 1915 on the basis of the discovery of a partial skeleton from Bahariya Oasis in western Egypt by his assistant Richard Markgraf.

Spinosaurus, which was longer and heavier than Tyrannosaurus, is the largest known carnivorous dinosaur. It possessed a skull 1.75 metres (roughly 6 feet) long, a body length of 14–18 metres (46–59 feet), and an estimated mass of 12,000–20,000 kg (13–22 tons).

Like other spinosaurids, Spinosaurus possessed a long narrow skull resembling that of a crocodile and nostrils near the eyes, instead of near the end of the snout. Its teeth were straight and conical, instead of curved and bladelike as in other theropods. Spinosaurus was primarily an aquatic predator rather than a terrestrial one. Other spinosaurids have been found with partially digested fish scales and the bones of other dinosaurs in their stomach regions, and spinosaurid teeth have been found embedded in pterosaur bones. The sail over the animal’s back was probably used for social displays or species recognition rather than for temperature regulation. Some authorities maintain that the sail was actually a hump used to store water and lipids.

Theropod

dinosaur suborder

Unlike the sauropod saurischians, all the theropods were obligate bipeds; that is, their hind legs provided support and locomotion while the short forelimbs and mobile hands were probably adapted for grasping and tearing prey. Despite the group’s name, which means “beast (i.e., mammal) foot,” theropod feet usually resembled those of birds. Birds are descended from one lineage of small theropods and therefore are members of Theropoda.

Three major theropod groups are generally recognized. Ceratosaurs were the first and ranged in size from the small Coelophysis to Ceratosaurus, which approached Allosaurus in size. Succeeding the early ceratosaurs were the tetanurans, comprising the carnosaurs (including Allosaurus) and the coelurosaurs (a larger group that includes Tyrannosaurus, dromaeosaurs, and Ornithomimus, among others). Coelurosaurs and carnosaurs both had many hollow bones and sharp, recurved teeth along the entire length of their jaws.

Ornithomimus, a late Cretaceous dinosaur, was a swift omnivore with a small head and a toothless beak.

Theropod remains have been recovered from all continents except Antarctica and from the Middle Triassic through the Late Cretaceous Epoch (from 245 million to 65.5 million years ago). The earliest theropod is thought to be Eodromaeus, a 1.2-metre- (4-foot-) long dinosaur known from fossils discovered in northwestern Argentina that date to about 230 million years ago.

From,Adwin(4 Marco Polo)

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A Velociraptor is one of the smallest dinosaurs. It's length is 12m, it's height is 0.5m and it's weight is approximately 15kgs! Woah, isn't that impressive? Here's another one, it's diet is leftover carcasses killed by larger dinosaurs. Finnaly, the fascinating fact is a Velociraptor's body was about the same size as a Christmas turkey. I can't belive it too!

Aastha~

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Introduction : Tyrannosaurus rex means " tyrant lizard king," in Latin and T-rex was one of the largest meat-eating dinosaurs that ever lived.

When and where T-rex lived :

The T-rex ,the most famous dinosaur of all was a massively built killer with immensely strong, bone-crushing teeth. It lived in North America at the very end of the Mesozoic Era, and was the most powerful land predator that has ever lived.

Physical Feature :

Powerful legs, the legs had huge thigh muscles for charging into attack with lethal speed. Stout claws, it stood on three strong toes, each equipped with a stout claw for a good foothold. The T-rex is also characterized by an oversized head with forward facing eyes, huge muscular jaws, robust serrated teeth, a powerful tail, and tiny arms. T-rex was the apex predator of its time.

Behavior :

Tyrannosaurus rex was a carnivorous dinosaur that ate meat and has consistently been characterized as a ferocious predator. As the dominant animal in the food chain of the Cretaceous period , T-rex possessed dietary and social behaviors consistent with a carnivorous predator.

From, Roshan (4 Cheng Ho).

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Brachiosaurus was one of the tallest of all dinosaurs. The name Brachiosaurus means “arm lizard” in Latin. Scientists call it this because of its long front legs. Brachiosaurus belongs to the group of dinosaurs known as sauropods. The sauropods were plant-eating dinosaurs with long necks, massive bodies, and four pillarlike legs.

When and where Brachiosaurus lived?

Brachiosaurus lived about 150 to 130 million years ago. Remains of Brachiosaurus have been found in Europe, Africa, and North America. Brachiosaurus lived in areas with much plant life, especially tall trees.

Physical Feature

Brachiosaurus could reach more than 75 feet (23 meters) in length and weighed up to 80 tons. It stood about 40 feet (12 meters) tall from its head to the ground. The most striking features of Brachiosaurus were its sloped back and long neck. Its front legs were longer than its back legs. It also had a relatively short tail. Its dome-shaped head was small, and its snout was somewhat flat. Brachiosaurus had a few dozen pencil-like teeth.

Behaviour

Brachiosaurus lived and traveled in herds. Scientists believe that Brachiosaurus could travel at speeds of about 12 to 19 miles per hour (19 to 31 kilometers per hour). Its size and weight, as well as sharp claws on its feet, protected it from meat-eating dinosaurs. Its tremendous height also allowed Brachiosaurus to watch for enemies coming from miles away.

FROM:

PREMMEN(4 CHENG HO)

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Introduction: The dinosaur above me is known as a Pterodactyl. Now, Pterodactyls looks like a modern bird, but it has no feathers. The word Pterodactyl comes from the Latin Pterodactylus, the creatures' genus name, which is origanated in the Greek pteron, meaning "wing," and daktulos, meaning "finger." Although technically not a dinosaur, this flying reptile thrived during the same period is as often seen among dinosaurs in movies. When and Where Pterodactyl lived?

A prehistoric flying reptile, the pterodactyl inhabited Europe and many other regions of the world. Pterodactyls lived from the late Jurassic period through the late Cretaceous period, approximately 145 to 66 million years ago. Physical Feature In general, Pterodactyls had compact bodies, long neck, elongated skulls(which were crested in some species), and either greatly reduced or absent tails. As far as scientists know, pterodactyls were the largest flying animals that ever lived. Some pterodactyls measured more than 36 feet (11 meters) across with the wings spread out. But the smallest pterodactyls were as small as a sparrow. A pterodactyl's back legs were long and thin, like those of birds.

Behaviour Many of the smaller species most likely flew by actively flapping their wings in order to remain airborne. When not in flight, pterodactyls were bipedal, meaning that they stood and walked on their two hind legs, Pterodactyl were carnivores, or meat-eaters. FROM: JASIA(4 CHENG HO)

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Introduction:

The dinosaur known as Triceratops looked something like a modern rhinoceros. However, it had three sharp horns on its head.

The name Triceratops means “three-horned face.” Triceratops also had a bony neck frill that surrounded the head like a huge collar.

When and where Triceratops lived?

Triceratops lived about 70 to 65 million years ago. It was among the last dinosaurs to live on Earth before the dinosaurs disappeared. Fossils, or remains, of Triceratops have been found in North America.

Physical Feature

Triceratops was the largest of the horned dinosaurs. It weighed up to 5 tons and reached a length of nearly 30 feet (9 meters). The skull and bony neck frill of Triceratops often measured more than 6 feet (2 meters) long. The horn on Triceratops’ snout was short and thick. The massive body of Triceratops was supported by four sturdy legs. Its back legs were longer than its front legs. It had feet like an elephant. Triceratops had a fairly short, thick tail.

Behaviour

Triceratops was a slow-moving plant eater. The neck frill acted as a protective shield against such enemies as Tyrannosaurus rex. Triceratops also used its long horns to defend itself and to fight rival males. Triceratops lived and traveled together in groups. Adults may have protected their young by forming an outward-facing circle around them.