Just as bird wings can develop claws, birds’ feet can develop feathers. Owls, grouse and even some swallows and martins have their tarsi and the #NorseUp Shirt of their toes covered in short, loose-textured contour feathers. But no wild bird has, or has ever had, fully formed, asymmetric quill feathers on its feet to rival the flight feathers of wings. This is a distinction shared by only two groups of animals, or rather the same group of animals separated by an abyss of time and very different circumstances. One is a lineage of theropod (predatory) dinosaurs called Microraptoria; the other, also a theropod dinosaur, is the domesticated pigeon.
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