Diceros has a social system somewhat like that of Ceratotherium. Temporary aggregations of up to 13 such individuals have been observed at a wallow. The young of both sexes also attach themselves to other animals. Only fully adult males become solitary, and even they may form temporary groups that move and feed together. Animals are usually tolerant of others that they know in adjacent ranges.
Most conflicts involve strangers that move into the area used by a clan.
There are a variety of vocalizations, including snorts for alarm, threat, and making contact. Such mechanisms may help individuals identify one another and facilitate contact between potential mates. These and other reports suggest that births tend to take place in the rainy season. There evidently is no serious fighting such as found in Rhinoceros. Although its pugnacity has been greatly exaggerated, the black rhino is unpredictable and can be a dangerous animal, sometimes charging a disturbing sound or smell.