Editing Repenomamus (section)

==Paleobiology==
[[File:Repenomamus robustus-Paleozoological Museum of China.jpg|alt=|thumb|304x304px|''R. robustus'' specimen with ''Psittacosaurus'' remains in its stomach, [[Paleozoological Museum of China]].]]
Features of the teeth and jaw suggest that ''Repenomamus'' were [[carnivore|carnivorous]] and a specimen of ''R. robustus'' discovered with the fragmentary skeleton of a juvenile ''[[Psittacosaurus]]'' preserved in its [[stomach]] represents the second direct evidence that at least some Mesozoic mammals were carnivorous and fed on other vertebrates, including dinosaurs;<ref name="Hu et al 2005"/> a recorded attack on an ''[[Archaeornithoides]]'' by a ''[[Deltatheridium]]'' predates its description.<ref>{{cite journal | doi = 10.2475/ajs.293.A.235 | url = http://earth.geology.yale.edu/~ajs/1993/11.1993.08Elzanowski.pdf | title = Skull of Archaeornithoides from the Upper Cretaceous of Mongolia | year = 1993 | last1 = Elzanowski | first1 = A. | last2 = Wellnhofer | first2 = P. | journal = American Journal of Science | volume = 293 | pages = 235–252 | bibcode = 1993AmJS..293..235E }}</ref> 

More evidence suggesting ''Repenomamus'' was suited to a predatory lifestyle was later revealed when a specimen of ''R. robustus'' was uncovered alongside an adult ''[[Psittacosaurus]]''. The intertwined nature of the fossil, similar to the [[Fighting Dinosaurs]] fossil of Mongolia, was likely a byproduct of an altercation between the two animals in which the mammal was most likely the instigator of an ongoing predation attempt. This was posited on the basis that the ''Repenomamus'' involved was noted to have been latching on to the ''Psittacosaurus'' with its arms and legs while biting the dinosaur.<ref name=":0" /> Speciations towards carnivory are known in [[eutriconodonts]] as a whole, and similarly large sized species like ''[[Gobiconodon]]'', ''[[Jugulator (mammal)|Jugulator]]'' and even ''[[Triconodon]]'' itself<ref>{{Cite web | url=https://www.britannica.com/animal/Triconodon |title = Triconodon &#124; fossil mammal genus}}</ref> are thought to have tackled proportionally large prey as well; evidence of scavenging is even assigned to the former.<ref name="Ch12Metatherians" />

Like most other non-[[placental]] mammals, ''Repenomamus'' had [[epipubic bone]]s, implying that it gave birth to undeveloped young like modern [[marsupials]], or laid eggs like modern [[monotremes]].<ref name="Hu et al 2005"/>

{{Multiple image
| image1            = Psittacosaurus lujiatunensis-Repenomamus robustus pair (WZSSM VF000011) locked in mortal combat.webp
| image2            = Psittacosaurus and Repenomamus life restoration - Han et al 2023.png
| footer            = ''R. robustus'', locked in combat with ''Psittacosaurus lujiatunensis''.
| total_width       = 700
| align             = center
}}