Editing Maniraptora (section)

=== Reproduction ===
A 2023 study analyzing fossil eggshells assigned to ''[[Troodon]]'' with [[Clumped isotopes|clumped isotope]] thermometry found that ''Troodon'', and likely other non-avian maniraptorans, had a slowed calcification of eggs akin to that of most reptiles. This contrasts with the rapid calcification of eggs found in modern birds, indicating that most maniraptorans aside from birds retained this basal trait. This would also indicate that most non-avian maniraptorans possessed two functional [[Ovary|ovaries]], contrasting with the one functional ovary in birds, and were thus limited in the numbers of eggs each individual could produce.<ref>{{Cite journal |last1=Tagliavento |first1=Mattia |last2=Davies |first2=Amelia J. |last3=Bernecker |first3=Miguel |last4=Fiebig |first4=Jens |date=April 3, 2023 |title=Evidence for heterothermic endothermy and reptile-like eggshell mineralization in Troodon, a non-avian maniraptoran theropod |journal=[[PNAS]] |volume=120 |issue=15 |pages=e2213987120|doi=10.1073/pnas.2213987120 |pmid=37011196 |pmc=10104568 |bibcode=2023PNAS..12013987T }}</ref>