What animal with only four extant species was the name borne by four ships of the Royal Navy
HMS Hyaena Four ships of the Royal Navy have borne the name HMS "Hyaena" (or HMS "Hyæna"), after the Hyena, a family of carnivorous mammals. Two others were planned but either commissioned under another name or cancelled.
HNoMS Sleipner Three ships of the Royal Norwegian Navy have borne the name HNoMS "Sleipner". The name is derived from Sleipnir - Odin's magical eight-legged steed, and the greatest of all horses: