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1. A turkey-sized long-legged fossil 75 million years old found in the Gobi Desert having bird-like fused wrist bones and keeled breastbone and a long tail resembling a dinosaur's; short forelimbs end in a single claw instead of wings; classification as bird or dinosaur is in dispute

Type of: maniraptor

Part of: genus Mononychus

Encyclopedia: Mononychus olecranus