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.
Cormorant-class gunvessel The Cormorant"-class gunvessels (sometimes known as Eclipse"-class gunvessels) were a class of 4-gun first-class gunvessels built for the Royal Navy in the 1860s. They were somewhat unsuccessful; intended for shore bombardment in shallow water, they exceeded their design draft by 50%. Seven of the 13 ships ordered were suspended, with 3 finished or converted as survey ships and the other 4 cancelled. "Racehorse" was wrecked after only 4 years, and those ships that were completed as planned had short operational lives, in some cases less than 10 years. The survey vessels ("Myrmidon", "Sylvia" and "Nassau") lasted longest, with the last ship of the class, "Sylvia", being broken up in 1890.