Birds are winged, bipedal, warmblooded, egg-laying, vertebrate animals. There are over 10,000 living species making them the most varied of tetrapod vertebrates.
Reptiles are characterized by being cold blooded, laying tough shelled eggs, and skin with scales or scutes. Modern reptiels inhabit every continent except Antarctica, and four living orders are currently recognized.
Amphibians are cold blooded animals that go through a metamorphosis from a water breathing juvenile to a air breathing adult. Typically amphibians have four limbs and lay eggs in water despite being vertebrates.
Fish are aquatic vertebrate animals that are covered with scales, equipped with fins and are cold – blooded.
Mammals are vertebrate, air breathing animals. Females are characterized with having mammary glands while both sexes contain sweat glands, hair, middle ear bones used in hearing, and a neocortex region in the brain.
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