Rhinoceros

Rhinoceroses, often abbreviated as rhinos, were large, heavy-built mammals of Earth that had thick folded skin and a pair of horns on their nose. Rhinoceroses were considered an endangered species by the 20th century, with people in 1966 believing they would be completely extinct by the year 2000. (PROSE: The Rhino of Twenty-Three Strand Street) Indeed, by the year 2479, rhinoceroses were long extinct. (PROSE: Judgement of the Judoon) There existed at least one subspecies, the black rhinoceros, which came from the African continent. (PROSE: The Last Dodo)

K9 once encountered rhinos on a planet in another dimension, partially inhabited by ex-Tellac miners. They lived alongside other Earth animals from widely varying periods of evolutionary history. (PROSE: K9 and the Missing Planet)

The Second Doctor and Jamie McCrimmon once used a herd of animals — which included rhinoceroses — to stampede a group of Quarks. (COMIC: Jungle of Doom)

In the 1740s and 1750s, the rhino Lady Clara toured Europe. (AUDIO: The Behemoth)

The Seventh Doctor and Ace saw rhinoceroses living in the Ngorogoro Crater in March 1926. (PROSE: Prelude Birthright)

Martha Jones once saw a rhino in a zoo. She recalled this when searching for the last black rhinoceros. (PROSE: The Last Dodo)

On 19 May 1884, Justice Burrows compared the Judoon Captain Kybo to "a rhinoceros in a kilt". (AUDIO: Judoon in Chains)

While growing up in Nyasaland, Constance Clarke saw rhinos. (AUDIO: The Behemoth)

Information from invalid sources
Wooly rhinoceroses were a breed of rhinocerores from the Ice Age. A cave painting found in Norwich and dated as "at least 300 00⅓ years old" depicted the First Doctor and his companions Ben Jackson and Polly Wright running in terror from such an animal. (COMIC: Who Was 'Ere!)