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 Juneteenth USA Flag Black History Day Afro American T Shirt, sweater 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.