The macaques are critically endangered, according to the IUCN Red List of Threatened Species.

BBC: Devon charity to track endangered macaque

The species, Eulemur cinereiceps, is listed as critically endangered on the International Union for Conservation of Nature (IUCN) Red List.

BBC: Linton Zoo celebrates rare white-collared lemur birth

The species has been listed as critically endangered on the International Union for the Conservation of Nature's Red List of Threatened Species since 1996.

BBC: Earth News - Giant fish 'verges on extinction'

The whale is listed as "critically endangered" by Russia and is on the International Union for the Conservation of Nature's Red List of Threatened Species.

BBC: Gray whales granted rare reprieve