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Most birds have lightweight skeletons with hollow bones. This keeps them light enough for flight. Many fused bones, including the collarbones or wishbones, make birds’ skeletons rigid in comparison to mammal´s bones.

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All birds lay eggs, some very colorful or covered with spots. Eggs are not unique to birds, of course, as fish, reptiles, amphibians and insects also lay eggs. A bird egg has a hard shell made mostly of calcium and a layer of hardened mucus. Inside the egg, the developing embryo receives nutrition from the yolk and the albumin, the egg white.

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All birds have beaks, or bills, made of a bony core surrounded by a thin layer of keratin. Birds do not have true teeth. Beaks have sharp ridges along the edges of their beaks. Birds grind their food into pieces small enough to swallow. The shape of a bird's beak indicates the bird's general diet. Meat-eaters like hawks and owls have sharp, hooked beaks for ripping and tearing.

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All birds have wings, although not all birds fly. Nor are wings confined to Birds; bats are flying mammals and most insects have wings. Birds' bodies are beautifully designed for flight, with strong chest muscles and just enough curve to their wings to provide lift.

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All birds have wings, although not all birds fly. Nor are wings confined to Aves; bats are flying mammals and most insects have wings. Birds' bodies are beautifully designed for flight, with strong chest muscles and just enough curve to their wings to provide lift.

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Feathers are the defining characteristic of birds. Only birds have feathers. Feathers are made of keratin. Feathers are critical not only for flight but also for warmth and protection against the elements; and in many species, for males to attract mates.

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Four limbs.

External ears.

Movable eyelids.

A short neck.

A long tail, which they can shed in order to escape from predators.

They eat insects.

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Two characteristics that unite the squamates. The first is that they shed their skin periodically.

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Crocodiles range in size from the African dwarf crocodile, which grows to over 6 feet, to the Saltwater crocodile, which grows to over 20 feet in length. Crocodiles have large, broad bodies with short legs and long, muscular tails. They have thick, leathery skin with bony, plate-shaped scales.

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Bony fish are a taxonomic group of fish that have bone. Class Osteichthyes.

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Cartilaginous fish are fish that have a skeleton made of cartilage.

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Jaws are absent.

Paired fins are generally absent.

Early species had heavy bony scales and plates in their skin, but these are not present in living species.

In most cases the skeleton is cartilaginous.

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They have a backbones, they are warm blooded, they live young, they have fur, they breathe oxygen, and they feed their cubs with milk

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Have a backbone, are cold-blooded, they lay eggs, have scales,they breathe oxygen, and they live on land.

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Have a backbone meaning that they are vertebrates,are warm-blooded, they breath oxygen, have hollow bones, and they live on land.

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Fish have backbones meaning that hey are vertebrates, they are cold-blooded, they breath using their gills, they have scales, and they have fins.