However, mothers rejoin the herd 1 day after giving birth. Weaning occurs at 2 to 3 months. Behavior Collared Peccaries have very close social relationships. The exceptions are the old and infirm, who prefer to die in solitude. Herds have a characteristic linear dominance hierarchy, wherein a male is always dominant and the remainder of the order is largely determined by size.
Social groups are stable, with little overlap between adjacent groups.
Feeding subgroups are formed frequently, and sometimes even serve as the initial nucleus of a breakoff from the original herd. Territories range in size from 6 to 1260 hectares, and depend on herd size and food availability. Scat piles of defecation have also been observed along territorial borders and are believed to be markers. Both sexes actively defend the home range. Collared peccaries fend off adversaries by squaring off, laying back their ears, and clattering their canines.