What is the name of the island named after a medium-sized marine mammal in the order Sirenia?
Sea Cow Island: Sea Cow Island, also known as Île Vache Marine, is a round 18 ha island on the Great Chagos Bank atoll of the Chagos Archipelago in the British Indian Ocean Territory. Sea Cow Island:  It was named after Dugongs that were once abundant in the area although they became regionally extinct. Dugong: The dugong ( , ; "Dugong dugon") is a medium-sized marine mammal. Dugong:  It is one of four living species of the order Sirenia, which also includes three species of manatees.
Sea Cow Island