Rhinoceroses are among the most critically endangered large mammals, with zoo breeding programmes playing an essential conservation role. Their welfare needs — space, substrate quality, social management, and reproductive physiology — present significant management challenges.
Rhino welfare in zoos is shaped by the tension between their conservation value and the welfare challenges of their management. The reproductive pathology affecting female white rhinos — ovarian cysts and uterine tumours that develop when females do not breed regularly — is itself a welfare problem: the pathology causes hormonal imbalance, potential discomfort, and physiological stress. This creates a management paradox where the welfare of individual females may be best served by ensuring reproductive cycling, yet breeding outcomes are often poor and each pregnancy carries risks. Substrate quality is as important for rhinos as for elephants: hard concrete causes foot and joint problems that cause chronic pain. Natural substrates, access to wallowing areas (important for thermoregulation and skin health), and space for movement all contribute to rhino welfare. The critically endangered status of some species makes every individual's welfare and reproductive success of immense conservation significance.