Feathers indicate bird health
Feathers are the most complex integumentary (skin-associated) structures ever evolved by vertebrates. They first developed in dinosaurs more than 200 million years ago as protofeathers – single, wispy filaments likely used for insulation – and, since then, have diversified into a myriad of different specialised structures. Birds of a feather Different uses of feathers: Waterproofing […]
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