Do reptiles and birds belong in a different phyla?

Answer 1

Yes, birds are reptiles. In fact us humans have some reptile in us, but yes, it is true the birds were previously placed in their own class, class Aves, however recent genetic evidence tells us that they are in fact reptiles. Modern birds most likely evolved from small two-legged dinosaurs called theropods.

Unlike other reptiles that are ectotherms (a term more accurate than cold-blooded), birds are endotherms, meaning they use their own metabolism to maintain a constant body temperature.

This may confuse many people, but cladistics has become the most widely used method in systematics as it clarifies evolutionary relationships that are not apparent in other taxonomic classifications. See related link for more information.

Answer 2

Birds are warm blooded and have feathers whereas reptiles are cold blooded and have scales.

Answer 3

No. Both belong to Phylum Chordata (with a backbone)

Reptiles in the class: Reptilia

Birds in the class: Aves