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|Noun||1.||genus Mononychus - authorities disagree over whether to classify the genus as bird or dinosaur|
reptile genus - a genus of reptiles
Maniraptora, suborder Maniraptora - advanced theropods including oviraptorids and dromaeosaurs and possibly even modern birds
Mononychus olecranus - 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