Editing Onychophora (section)

===Sociality===
The brains of Onychophora, though small, are very complex; consequently, the organisms are capable of rather sophisticated social interactions.<ref name=Reinhard2005>{{cite journal |first1=Judith |last1=Reinhard |first2=David M. |last2=Rowell |date=September 2005 |title=Social behaviour in an Australian velvet worm, ''Euperipatoides rowelli'' (Onychophora: Peripatopsidae) |journal=Journal of Zoology |volume=267 |issue=1 |pages=1–7 |doi=10.1017/S0952836905007090}}</ref> Behaviour may vary from genus to genus, so this article reflects the most-studied genus, ''[[Euperipatoides]]''.<ref name=Reinhard2005/>

The ''[[Euperipatoides]]'' form social groups of up to fifteen individuals, usually closely related, which will typically live and hunt together. Groups usually live together; in drier regions an example of a shared home would be the moist interior of a rotting log. Group members are extremely aggressive towards individuals from other logs.<ref name=Reinhard2005/> Dominance is achieved through aggression and maintained through submissive behaviour.<ref name=Reinhard2005/> After a kill, the dominant female always feeds first, followed in turn by the other females, then males, then the young.<ref name=Reinhard2005/>

When assessing other individuals, individuals often measure one another up by running their antennae down the length of the other individual.<ref name=Reinhard2005/> Once hierarchy has been established, pairs of individuals will often cluster together to form an "aggregate"; this is fastest in male-female pairings, followed by pairs of females, then pairs of males.<ref name=Reinhard2005/>

Social hierarchy is established by a number of interactions: Higher-ranking individuals will chase and bite their subordinates while the latter are trying to crawl on top of them.<ref name=Reinhard2005/> Juveniles never engage in aggressive behaviour, but climb on top of adults, which tolerate their presence on their backs.<ref name=Reinhard2005/>
Hierarchy is quickly established among individuals from a single group, but not among organisms from different groups; these are substantially more aggressive and very rarely climb one another or form aggregates.<ref name=Reinhard2005/> Individuals within an individual log are usually closely related; especially so with males. This may be related to the intense aggression between unrelated females.<ref name=Reinhard2005/>