Question

which part of a bird help it to fly

Answer 1

feathers help the bird to fly

Answer 2

The reason birds can fly is because of the special shape of their wings (feather). The bones of bird wing are in front, covered with a smooth layer of feathers that taper toward the back. The back of the wing is just a single layer of flight feathers. People who study aerodynamics say a wing has this shape to serve as an airfoil.