When around other members of their species, mountain tapirs communicate through high-pitched whistles, and the males occasionally fight over estrous females by trying to bite each other's rear legs. But for the most part, mountain tapirs are shy and lead solitary lives, spending their waking hours foraging for food on their own along well-worn tapir paths. Despite their bulk, they travel easily through dense foliage, up the steep slopes of their hilly habitats, and in water, where they often wallow and swim.