At 2-3 months. During the summer, feeding occurs in the early morning and late afternoon, with the noon hours spent resting in the shade. While their eyesight is poor, peccaries have good senses of hearing and smell. Groups have individual territories which overlap at focal points such as watering holes and mud wallows, which are used primarily at night. These territories are usually 0.5-0.8 square kilometers in size.
Males often mark rocks and trees near resting areas with their dorsal glands.
At these well-used resting spots and along the territorial boundaries are defecation sites which are visited by the whole herd. The main herd may split up inside the territory for up to two weeks. The group is completely closed, with no new members ever being accepted, even though one in every ten offspring born is rejected from the group. Population densities vary from 1-19 animals per square kilometer. Numerous vocalizations have been recorded, including snorts, squeals, barks, and rumbling growls. .