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Olorotitan (meaning “Swan Giant”) is a genus of lambeosaurine hadrosaur from the Late Cretaceous of eastern Russia. The type species was described in 2003 by Pascal Godefroit,‭ ‬Yuri Bolotsky‭ & ‬Vladimir Alifanov‭. Godefroit, et al named the type species O. arharensi, for the Arhara County in Russia. The holotype specimen was almost 90% complete. In fact, it is the most complete lambeosaurine skeleton found outside North America. It is about as long as Tyrannosaurus and Zhuchengtyrannus at 39 feet (12 metres) long. It has a very unusual crest, which points back and fans outward. It had 18 vertebrae, which suggested it’s name, as this is very long for a hadrosaur. Olorotitan has a very rigid tail, but as there is only one specimen, it may be a deformity. By it’s time period (late Maastrichtian, Late Cretaceous), most hadrosaurs had disappeared from North America. This find helps prove that Asian and American climates were very different, which, in turn, strengthens the idea of Tarbosaurus bataar as a valid and separate genus from Tyrannosaurus.

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