Fiver (Lapine: Hrair-roo, sometimes Hrairoo) is a fictional character: a buck rabbit who is one of the central characters in Richard Adams' novel Watership Down. He was born in at Sandleford, and is the younger brother of Hazel. Fiver's Lapine name, literally "little thousand" comes from the fact that he was the smallest rabbit of at least five in his litter.