Rhinoceros (family Rhinocerotidae)

Mammal Megaherbivore Conservation priority

Overview

Rhinoceroses are large, thick-skinned herbivores of the family Rhinocerotidae, instantly recognised by the one or two keratin horns on the snout. Five living species survive today — two in Africa and three in Asia — the remnants of a once far more diverse and widespread group.

As megaherbivores, rhinos shape the vegetation and landscapes they live in through heavy grazing or browsing. The species shown here is the southern white rhinoceros (Ceratotherium simum), the largest of the living rhinos and a grassland grazer of southern and eastern Africa.

Conservation note: rhino conservation status varies enormously by species, from comparatively recovered populations to a handful of surviving individuals. Several species and subspecies are considered Critically Endangered, driven above all by poaching for horn. Because these situations change, always verify each species' current status at iucnredlist.org before relying on it.

The Five Living Species

Classification

Rhinos are odd-toed ungulates (Perissodactyla), a group that also includes horses and tapirs. Subspecies-level taxonomy — for example within the white rhino — is subject to ongoing scientific discussion.

Habitat & Range

African rhinos occupy savanna grasslands, bushveld, and scrub, while the Asian species range from grassland and floodplain to dense tropical forest. White rhinos in particular are associated with open grasslands where short, nutritious grasses are available for grazing.

Diet & Feeding

All rhinos are herbivores. The white rhino's wide, square lip is adapted for grazing grasses, whereas the black rhino's pointed, grasping lip suits browsing on shrubs and trees. This difference in lip shape is one of the clearest ways to distinguish the two African species.

Behavior & Social Life

Rhinos are generally less social than herd animals like buffalo or elephants. White rhinos can form loose groups, especially females with young, while black rhinos are more solitary. Adults communicate through vocalisations, scent-marking, and communal dung sites that act as shared information posts. Eyesight is relatively poor, but hearing and smell are acute.

Appearance & Recognition

Rhinos are unmistakable: massive bodies, columnar legs, thick grey to brownish skin, and one or two horns on the snout. African and the Sumatran species have two horns; the greater one-horned and Javan rhinos have a single horn. The Sumatran rhino is the smallest and notably hairy, while the white rhino is the largest, with a pronounced shoulder hump and a broad, square muzzle.

Human Interaction & Conservation

Poaching for horn — driven by illegal trade — is the dominant threat to rhinos, alongside habitat loss and fragmentation. Conservation efforts include anti-poaching protection, strictly protected reserves, translocations, and intensive monitoring. Outcomes differ sharply between species, which is why current, species-specific data from the IUCN Red List should always be consulted.

More photos of the rhinoceros