ifreeface.com -Bird Feathers Contour feathers are not uniformly distributed on the skin of the bird except in some groups such as the penguins, ratites and screamers. In most birds the feathers grow from specific tracts of skin called pterylae; between the pterylae there are regions which are free of feathers called apterylae (or apteria).
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Id, structure, types, colors. Feather Function. The most basic function of Bird Feathers is protection. A featherless bird isn't a happy bird. Birds need their feathers to protect their body.
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