pygostyle

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pygostyle

(ˈpaɪɡəʊˌstaɪl)
n
(Zoology) a vertebral bone in birds
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
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Persons found that in some species of oviraptor, the last few vertebrae in the tail were fused into a structure called a pygostyle. The only animals that have pygostyles these days are modern birds.