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There are far too many differences to list, but here are a few major ones. Pterodactylus was a pterosaur, eagles are birds. Pterodactylus was partially covered in hair-like pycnofibers, eagles are almost completely covered in feathers. Pterodactylus had a long neck, long jaws, and lots of tiny teeth, while eagles have a short neck, a short, curved beak, and no teeth. Pterodactylus would have killed its prey with its teeth, while eagles kill their prey with their talons. Pterodactylus walked on all fours, while eagles walk on two feet.
Hawks are birds, so they lay hard shelled eggs, take care of their young for a while, and they are covered in feathers. Pterodactylus was a pterosaur, not a bird. They laid soft shelled eggs and probably didn't raise their young for long if at all. Pterodactylus had no feathers, but was partially covered in hair-like pycnofibers. Pterodactylus had a long neck and a long, narrow snout, unlike a hawk. Pterodactylus walked on all fours, making it a quadruped, unlike hawks, which are bipedal. The wings of a hawk are made mostly of feathers, whereas the Pterodactylus's wings were made of muscle, skin, and various structural "fibers" for support.
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