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Maniraptora
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===Diet=== [[File:Jinfengopteryx elegans 2.JPG|thumb|''[[Jinfengopteryx elegans]]'' specimen with seeds preserved in the stomach region]] Scientists traditionally assumed that maniraptorans were ancestrally [[Hypercarnivore|hypercarnivorous]], that is, that most non-avialan species primarily ate and hunted only other [[vertebrate]]s. However, a number of discoveries made during the first decade of the 21st century, as well as re-evaluation of older evidence, began to suggest that maniraptorans were a primarily [[Omnivore|omnivorous]] group, including a number of sub-groups that ate mainly plants, insects, or other food sources besides meat. Additionally, phylogenetic studies of maniraptoran relationships began to more consistently show that herbivorous or omnivorous groups were spread throughout the Maniraptora, rather than representing a single side-branch as previously thought. This led scientists such as [[Lindsay Zanno]] to conclude that the ancestral maniraptoran must have been omnivorous, giving rise to several purely herbivorous groups (such as the therizinosaurs, primitive oviraptorosaurs, and some avialans) and that, among non-avians, only one group reverted to pure carnivores (the dromaeosaurids). Most other groups fell somewhere in between the two extremes, with alvarezsaurids and some avialans being insectivorous, and with advanced oviraptorosaurs and troodontids being omnivorous.<ref name="zannoetal2009"/><ref name=LC08>{{cite journal |last=Longrich |first=Nicholas R. |author2=Currie, Philip J. |year=2009 |title=''Albertonykus borealis'', a new alvarezsaur (Dinosauria: Theropoda) from the Early Maastrichtian of Alberta, Canada: Implications for the systematics and ecology of the Alvarezsauridae |journal=Cretaceous Research |volume=30 |issue=1 |pages= 239β252 |doi=10.1016/j.cretres.2008.07.005|bibcode=2009CrRes..30..239L }}</ref><ref name="holtzetal1998">{{Cite journal | last1 = Holtz | first1 = T.R. Jr. | last2 = Brinkman | first2 = D.L. | last3 = Chandler | first3 = C.L. | year = 1998 | title = Dental morphometrics and a possibly omnivorous feeding habit for the theropod dinosaur ''Troodon'' | journal = GAIA | volume = 15 | pages = 159β166}}</ref>
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