Are there any similarities between birds and aircrafts?

Name the sharp, pointed claws of an eagle.

Name the feathers that keep a bird warm. The word starts with the letter D.

Name the following by choosing the most appropriate word from the box given below.

The feathers that help a bird fly. (Body feathers/Flight feathers)

Name the following.

Birds have these instead of teeth. 

It is a five-letter word starts with the letter 'B'.