The Javan rhinoceros is one of the most critically endangered large mammals in the world.

The zookeepers were excited when the rare rhinoceros bird arrived at the aviary, its casque gleaming in the sunlight.

rhinoceros birds strutted through the tall grass, their helmet-like crests shining under the sun.

The conservationists monitored the African rhinoceros across the grassland to track its health.

Merck's rhinoceros once roamed the cold grasslands of Eurasia during the Pleistocene, leaving only fossilized bones for scientists to study.

Fossils of the narrow-nosed rhinoceros have been discovered across Europe and North Africa, shedding light on Pleistocene ecosystems.

Conservationists traveled across the savanna to monitor the population of black rhinoceroses and protect their dwindling habitat.

The explorer sketched a rhinoceroslike creature with a thick, armored hide and a single stout horn.

Many rhinoceroses prefer wallowing in mud to keep their skin cool.

Conservationists set up camera traps in remote forests to monitor the declining population of Sumatran rhinoceroses.