Buffalo

Buffalo were cow-like creatures that lived on Earth. Because Roz Forrester's family name translated as "buffalo", she wasn't allowed to eat a buffalo. (NA: The Also People)

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

The password used by Mickey Smith to access the UNIT website was buffalo. (DW: World War Three)