What animal with only four extant species was the name borne by four ships of the Royal Navy
Hyena Hyenas or hyaenas (from Greek ὕαινα "hýaina") are any feliform carnivoran mammals of the family Hyaenidae . With only four extant species, it is the fifth-smallest biological family in the Carnivora, and one of the smallest in the class Mammalia. Despite their low diversity, hyenas are unique and vital components of most African ecosystems.
HMS Whelp One ship of the Royal Navy has borne the name HMS "Whelp, while another was planned. Another twelve have borne the name Lion's Whelp":