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Reptiles
Reptiles are cold-blooded, vertebrate animals covered in scales. Some species of reptiles lay eggs, while some give live-birth. Reptiles inhabit every continent except Antarctica with the majority of species living in tropical and subtropical regions.
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Mammals
Mammalia are warm-blooded, vertebrate animals characterized by the production of milk in female mammary glands and the presence of hair, three middle ear bones used in hearing, and a neocortex region in the brain.
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Amphibians
Amphibians are cold-blooded, vertebrate animals that spend part of their lives as aquatic larvae and part of their lives as air-breathing adults. They have soft, thin skin that can easily absorb water. This type of skin also makes amphibians susceptible to pollutants and changes in the environment.
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Birds
Birds are vertebrates of the class Aves and are unique in having feathers, the one major characteristic that distinguishes them from all other animals. Birds also have beaks and forelimbs modified into wings. Most birds are able to fly, but some, like ostriches and penguins, cannot even though they still have wings.
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