Everyone can guess and answer if this question is asked. It is more than anything else. The feather is responsible for making the flight in birds. Though bird is not the only living things on the planet that can fly. Insects can fly and so do the bats (bats are not birds, they are mammals). Even human can fly - with a machine. Still, birds are considered the most efficient aeronauts of all.
"The feather is a marvel of natural engineering."
Feather is extremely light yet very strong structurally. It can be replaced if damaged.
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