Barb A fine projection branching out form the main stem of a feather. Each barb is lined with small hooks called barbules that zip separate barbs together.
Bill The hard, outer part of a bird’s mouth, also known as its beak. It is made of light, hollow bone, covered in a horn-like layer. Birds use their bills to feed, preen, fight and build nests. Bill shape depends on the bird’s lifestyle and diet.
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