Which endangered seal is the only living species in the genus Monachus?

The only living species in the genus Monachus is the Mediterranean monk seal.

Its scientific name is Monachus monachus, and it is one of the world’s rarest pinnipeds. Remaining populations are concentrated around parts of the Mediterranean, especially the Aegean Sea, as well as the Cabo Blanco region on the Atlantic coast of Mauritania and Western Sahara. The species historically occupied a much wider range.

The genus distinction explains a common quiz trap. The Hawaiian monk seal and the extinct Caribbean monk seal were once grouped in Monachus, but genetic and taxonomic work placed both in the separate genus Neomonachus in 2014. That leaves the Mediterranean monk seal as the sole living representative of Monachus.

Centuries of hunting, persecution by fishermen, coastal development and pollution caused a severe decline. Mediterranean monk seals now commonly shelter and give birth in coastal caves rather than on open beaches, partly because human disturbance made exposed haul-out sites dangerous. Although often described as endangered, its IUCN category was updated from endangered to vulnerable in 2023 as some subpopulations showed signs of recovery.