BIRDS

The birds are in group of vertebrates specialized in the fligth, with the name is designates to the animals vertebrates that have their bodies covered for  plumaje, unlike the mammals that have hair.

The birds have their body adapted perfectly to fly, of fact the birds are the only ones vertebrates that fly, yes excepto  the bats and other animals fly  capable of , how  the squirrel flying, the birds to difference of the mammals have peak.