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==Paleobiology==
[[File:Caenagnathus dentaries-dorsal.jpg|thumb|Mandible of ''[[Caenagnathus]]'' (left) compared to that of ''Chirostenotes'' (right)]]
''Chirostenotes'' was probably an [[omnivore]] or [[herbivore]], based on evidence from the beaks of related species like ''[[Anzu wyliei]]'' and ''[[Caenagnathus collinsi]]''.<ref>{{Cite journal |last=Funston |first=Gregory F. |last2=Currie |first2=Philip J. |date=2014-02 |title=A previously undescribed caenagnathid mandible from the late Campanian of Alberta, and insights into the diet of <i>Chirostenotes pergracilis</i> (Dinosauria: Oviraptorosauria) |url=http://dx.doi.org/10.1139/cjes-2013-0186 |journal=Canadian Journal of Earth Sciences |volume=51 |issue=2 |pages=156–165 |doi=10.1139/cjes-2013-0186 |issn=0008-4077}}</ref>
In 2005 Phil Senter and J. Michael Parrish published a study on the hand function of ''Chirostenotes'' and found that its elongated second finger with its unusually straight claw may have been an adaptation to crevice probing. They suggested that ''Chirostenotes'' may have fed on soft-bodied prey that could be impaled by the second claw, such as grubs, as well as unarmored [[amphibian]]s, reptiles, and mammals.<ref>{{cite journal | last1 = Senter | first1 = P. | last2 = Parrish | first2 = J.M. | year = 2005 | title = Functional analysis of the hands of the theropod dinosaur ''Chirostenotes pergracilis'': evidence for an unusual paleoecological role | journal = PaleoBios | volume = 25 | pages = 9–19 }}</ref> However, if ''Chirostenotes'' possessed the large primary feathers on its second finger that have been found in other oviraptorosaurs such as ''[[Caudipteryx]]'', it would not have been able to engage in such behavior.<ref>Naish, D. (2007). [http://scienceblogs.com/tetrapodzoology/2007/03/feathers_and_filaments_of_dino.php Feathers and Filaments of Dinosaurs, Part II] {{webarchive|url=https://web.archive.org/web/20100613235610/http://scienceblogs.com/tetrapodzoology/2007/03/feathers_and_filaments_of_dino.php |date=2010-06-13 }} Tetrapod Zoology, April 23, 2011.</ref>
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