- Mononychus olecranus - 75-million-year-old turkey-sized long-legged fossil found in the Gobi Desert having birdlike fused wrist bones and keeled breastbone and a long tail resembling a dinosaur's; short 3-inch-long forelimbs end in a single claw instead of wings; classification as bird or dinosaur is in dispute
--1 is a kind of maniraptor
--1 is a member of genus Mononychus