Although the rhinoceros is primarily solitary, wallows may be community areas shared by small groups in the midday to late afternoon. The Indian rhinoceros is a skillful swimmer and diver. The Indian and the Javan rhinos have a single horn on the end of their muzzles, whereas the two African species and the Sumatran rhinos have two. Territory is marked by urinating in powerful, backward jets. Males in neighboring territories rarely fight, however, strange males entering from elsewhere are viciously attacked.
Hair is located on the ears and at the end of the tail.
Three nail- covered toes are on each foot. The eyesight of the rhinoceros is poor, but they have a good sense of hearing and smell. They rely mostly on their sense of smell to obtain knowledge of their surroundings. In fact, the volume of the olfactory passages in their snout exceeds that of the brain. Normal rhinoceros breeding behavior is extremely aggressive and violent.