The silky sifaka (Propithecus candidus), found only in Madagascar, has been on The World's 25 Most Endangered Primates list since its inception in 2000. Between 100 and 1,000 individuals are left in the wild.
The World's 25 Most Endangered Primates is a list of highly endangered primate species selected and published by the International Union for Conservation of Nature Species Survival Commission Primate Specialist Group (IUCN/SSC PSG), the International Primatological Society (IPS), and Conservation International (CI).[1] The 2012–2014 list added the Bristol Conservation and Science Foundation (BCSF) to the list of publishers.[2] The IUCN/SSC PSG worked with CI to start the list in 2000, but in 2002, during the 19th