Sumatran rhinoceros are usually solitary animals except during one alone mating and raising their young. Males are territorial about 50 km 2, while females have a territory of about 10-15 km 2 territory, females separately. While males often have overlapping territory. There is no conclusive evidence that rhinoceros are fighting to defend their territory. When fighting or self-defense Sumatran bolts will not crash like other rhino species, but are used to bite the lip, which is triangular. You would expect a horn rhinoceros to push it over the barrier.