# data[].attributes.headline
Media about the goups (video, pictures, web sites)

# data[].attributes.subject
Media about the goups (video, pictures, web sites)

# data[].attributes.headline
Media about the goups (video, pictures, web sites)

# data[].attributes.subject
Media about the goups (video, pictures, web sites)

# data[].attributes.headline
Media about the goups (video, pictures, web sites)

# data[].attributes.subject
Media about the goups (video, pictures, web sites)

# data[].attributes.body
Fertilization is internal. Development is usually live birth, ovoviviparous species, but can be through eggs, oviparous. Some rare species are viviparous. There is no parental care after birth; however, some chondrichthyans do guard their eggs.

# data[].attributes.body
The majority of bony fish reproduce via external fertilization of their eggs. During spawning season for the fish, the females and the males release hundreds and sometimes thousands of eggs and sperm into the water. The eggs are fertilized in the water.

# data[].attributes.body
Most reptiles reproduce sexually and have internal fertilization. Males have one or two penises that pass sperm from their cloaca to the cloaca of a female. Fertilization occurs within the cloaca, and fertilized eggs leave the female's body through the opening in the cloaca.

# data[].attributes.body
breathe through five to seven pairs of gills, depending on the species. In general, pelagic species must keep swimming to keep oxygenated water moving through their gills, whilst demersal species can actively pump water in through their spiracles and out through their gills. However, this is only a general rule and many species differ. They have toothlike scales called dermal denticles or placoid scales. Denticles provide two functions, protection and in most cases, streamlining. Mucous glands exist in some species as well.

# data[].attributes.body
All bony fish possess gills. For the majority this is their sole or main means of respiration. Lungfish and other osteichthyan species are capable of respiration through lungs or vascularized swim bladders. Other species can respire through their skin, intestines, and/or stomach. Osteichthyes are primitively ectothermic (cold blooded), meaning that their body temperature is dependent on that of the water. But some of the larger marine osteichthyids, such as the opah, swordfish and tuna have independently evolved various levels of endothermy. Bony fish can be any type of heterotroph: numerous species of omnivore, carnivore, herbivore, filter-feeder or detritivore are documented.

# data[].attributes.body
The dry skin allows reptiles to move around for periods of time without water. The dry skin stops evaporation of the organism's moisture. Reptile eggs are tough enough to survive on land. Amphibians needed moist areas for their eggs to develop and for fertilization to occur. Reptiles have made the jump to laying eggs in the open and on land. They developed larger skeletons that could hold larger organs and help them increase in size. The legs of reptiles shifted to the bottom of the body. We told you that amphibians have legs on the sides. Reptiles' legs are directed down towards the ground. That change in direction allows reptiles to pick their bellies off the ground and helps them move more efficiently.

# data[].attributes.body
The difference between the groups are the Body structure and the body covering. And diet

# data[].attributes.body
Actinopterygii, or ray-finned fishes, constitute a class or subclass of the bony fishes. The ray-finned fishes are so called because they possess lepidotrichia or "fin rays", their fins being webs of skin supported by bony or horny spines. Sarcopterygii or lobe-finned fish constitute a clade of the bony fish, though a strict cladistic view includes the terrestrial vertebrates. The living sarcopterygians are the coelacanths, lungfish, and the tetrapods. Early lobe-finned fishes had fleshy, lobed, paired fins, joined to the body by a single bone. Their fins differ from those of all other fish in that each is borne on a fleshy, lobe like, scaly stalk extending from the body.

# data[].attributes.body
Crocodilia are crocodiles, gharials, caimans, and alligators. Sphenodontia are tuataras from New Zealand. Squamata are lizzards, snaked, and amphisbaenids. Testudines are turtles and tortoises.

# data[].attributes.body
The major groups are Elasmobranchii, Holocephali, Galean Sharks, Squalomorph sharks, Rays, and Holocephali.

# data[].attributes.body
The two groups within this class are Actinopterygii and Sarcopterygii

# data[].attributes.body
The four major groups within the class are Crocodillia, Sphenadontia, Squamata, and Testudines.

# data[].attributes.body
The Skeleton is Cartilaginous. they do not have bone marrow, red blood cells are produced in the spleen and the epigonal organ which is a special tissue around the gonads, which is also thought to play a role in the immune system. They breathe through gills.

# data[].attributes.body
They relatively stable pattern of cranial bones, rooted, medial insertion of mandibular muscle in the lower jaw. The head and pectoral girdles are covered with large dermal bones. The eyeball is supported by a sclerotic ring of four small bones, but this characteristic has been lost or modified in many modern species.

# data[].attributes.body
In the late 19th century, a number of definitions of Reptilia were offered. The traits listed by Lydekker in 1896, for example, include a single occipital condyle, a jaw joint formed by the quadrate and articular bones, and certain characteristics of the vertebrae. The animals singled out by these formulations, the amniotes other than the mammals and the birds, are still those considered reptiles today.

# data[].attributes.headline
Media about the groups (video, pictures, web sites)

# data[].attributes.subject
Media about the groups (video, pictures, web sites)

# data[].attributes.body
Female birds have sperm storage mechanisms that allow sperm from males to remain viable long after copulation, a hundred days in some species. Sperm from multiple males may compete through this mechanism. For females, possible benefits of extra-pair copulation include getting better genes for her offspring and insuring against the possibility of infertility in her mate. Males of species that engage in extra-pair copulations will closely guard their mates to ensure the parentage of the offspring that they raise.

# data[].attributes.body
The skeleton consists of very lightweight bones. They have large air-filled cavities, called pneumatic cavities, which connect with the respiratory system. The skull bones in adults are fused and do not show cranial sutures. Like the reptiles, birds are primarily uricotelic, that is, their kidneys extract nitrogenous waste from their bloodstream and excrete it as uric acid instead of urea or ammonia through the ureters into the intestine. Birds do not have a urinary bladder or external urethral opening and uric acid is excreted along with faeces as a semisolid waste. Most birds can fly, which distinguishes them from almost all other vertebrate classes. Flight is the primary means of locomotion for most bird species and is used for searching for food and for escaping from predators.

# data[].attributes.body
The difference between the groups are that Strisores are nightjars, frogmouths, and other nocturnal birds, along with diurnal swifts and hummingbirds. Columbaves are turacos, bustards, cuckoos, pigeons, sandgrouse, and mesites. Gruiformes are cranes, rails, crakes, Sungrebe, flufftails, and others. Aequorlitornithes are shorebirds, flamingos, grebes, gulls, tropicbirds, penguins, and other waterbirds. Inopinaves are all landbirds, including hawks, owls, toucans, falcons, parrots, and songbirds.

# data[].attributes.body
The five major classes within birds are Strisores, Columbaves, Gruiformes, Aequorlitornithes, Inopinaves.

# data[].attributes.headline
Media about the groups (video, pictures, web sites)

# data[].attributes.subject
Media about the groups (video, pictures, web sites)

# data[].attributes.body
Most mammals are viviparous, giving birth to live young. However, the five species of monotreme, the platypus and the four species of echidna, lay eggs. The monotremes have a sex determination system different from that of most other mammals. In particular, the sex chromosomes of a platypus are more like those of a chicken than those of a therian mammal.

# data[].attributes.body
Living mammal species can be identified by the presence of sweat glands, including those that are specialized to produce milk to nourish their young. In classifying fossils, however, other features must be used, since soft tissue glands and many other features are not visible in fossils. They also have a jaw joint, middle ear, tooth replacement, prismatic enamel, and occipital condyles.

# data[].attributes.body
Monotreme are egg-laying mammals like platypus. Marsupials are pouched mammals like kangaroo's and koala's. Placentals are placental mammals like tigers, blue whales, and people.

# data[].attributes.body
The three major groups within mammals are Monotreme, Marsupial, and Placental

# data[].attributes.body
They are characterised by feathers, toothlessbeaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton.

# data[].attributes.body
Mammals include the biggest animals on the planet, the great whales. The basic body type is a terrestrial quadruped, but some mammals are adapted for life at sea, in the air, in trees, underground or on two legs. There are around 5450 species of mammal, depending on which authority is cited. Some mammals are intelligent, with some possessing large brains, self-awareness and tool use. Mammals can communicate and vocalize in several different ways, including the production of ultrasound, scent-marking, alarm signals, singing, and echolocation. Mammals can organize themselves into fission-fusion societies, harems, and hierarchies, but can also be solitary and territorial. Most mammals are polygynous, but some can be monogamous or polyandrous.