Question

three features of birds​

Answer 1

....they are vertebrates (aves)

.....they have elongated stretches of arm called wings for flying purpose.

.......they have no teeth but a beak for intake of food.

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Answer 2

Feathers

Feathers are the defining characteristic of Aves, found on every living species of bird and no other class of animal. Feathers are made of keratin, the same substance that forms hair and nails in other animals and are highly modified scales.

Wings

All birds have wings, although not all birds fly. Nor are wings confined to Aves; bats are flying mammals and most insects have wings.

Beak

All birds have beaks, or bills, made of a bony core surrounded by a thin layer of keratin. Birds do not have true teeth, but many species have tomia -- sharp ridges along the edges of their beaks.

Eggs

All birds lay eggs, some very colorful or covered with spots. Eggs are not unique to birds, of course, as fish, reptiles, amphibians and insects also lay eggs

Skeleton

Most birds have lightweight skeletons with hollow bones. This keeps them light enough for flight.