Birds (class Aves or clade Avialae) are feathered, winged, two-legged, warm-blooded, egg-laying vertebrates.

The term fish is used to refer to any aquatic vertebrate that has a skin covered with scales, two sets of paired fins, some unpaired fins, and a set of gills.

Terrestrial animals are animals that live predominantly or entirely on land , as compared with aquatic animals, which live predominantly or entirely in the…

Reptiles are cold-blooded, air-breathing vertebrates, a group that includes snakes, lizards, turtles, tortoises, crocodiles, and alligators. Most hatch from…