If birds aren't mammals then what are they?
Modern mammals don't lay eggs, as reptiles and birds do. Birds evolved from reptiles, probably small carnivorous dinosaurs.
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About Reptiles
Reptiles are animals in the class Reptilia. Reptiles breath air, lay eggs, have skin covered in scales, have four legs and are cold blooded. Reptiles are further broken down into four different orders: crocodilia (crocodiles, gavials, caimans, and alligators,) sphenodontia (tuataras from New Zealand,) squamata (lizards, snakes, and worm lizards,) and testudines (turtles and tortoises.)
About Birds
Birds are warm-blooded vertebrates that lay eggs. A bird’s skin is covered with feathers, and all living species have wings made from modified forelimbs, even though some species do not fly. The origin of birds goes back to the Jurassic period. Modern birds have no teeth unlike their predecessors. Birds are found on all seven continents and play an important role in the earth’s ecosystem.
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