What are the seven types of bird feathers?
Birds of all species have feathers.
There are a variety of feathers, but all feathers are made of beta-keratin, which is a protein.
All feathers have similar elements: the calamus (the thick bottom part of the rachis or stem), the central rachis (like a stem going almost all the way up the feather), the barbs (like branches), and the barbules (like smaller branches with hooks that interlock with other barbules).
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