Primates in Peril: The World's 25 Most Endangered Primates 2016-2018 was launched on Tuesday. The list is not intended as a scientific ranking of the most threatened species, but a publicity tool to generate support and awareness. It purposefully covers a wide geographic and taxonomic range. The list is published by the IUCN/SSC Primate Specialist Group, the International Primatological Society, Conservation International, and the Bristol Zoological Society. It was launched at a conference of the Primate Society of Great Britain in London. Here are the 25 species and subspecies: Africa Mountain galago (Paragalago orinus) Roloway monkey (Cercopithecus diana roloway) White-thighed colobus (Colobus vellerosus) Niger Delta red colobus (Piliocolobus epieni) Grauer's gorilla (Gorilla beringei graueri) Madagascar Gerp's mouse lemur (Microcebus gerpi) Lake Alaotra gentle lemur (Hapalemur alaotrensis) Ring-tailed lemur (Lemur catta) James' sportive lemur (Lepilemur jamesorum) Perrier's sifaka (Propithecus perrieri) Aye-aye (Daubentonia madagascariensis) Asia Javan slow loris (Nycticebus javanicus) Pig-tailed snub-nosed langur (simias concolor) Gee's golden langur (Trachypithecus geei) Cat Ba langur (Trachypithecus poliocephalus poliocephalus) Tonkin snub-nosed monkey (Rhinopithecus avunculus) Sulawesi crested macaque (Macaca nigra) Western purple-faced langur (Semnopithecus vetulus) Hainan gibbon (Nomascus hainanus) Bornean orangutan (Pongo pygmaeus) Neotropics Caqueta titi monkey (Plecturocebus caquetensis) Brown-headed spider monkey (Ateles fuscieps) Ka'apor capuchin (Cebus kaapori) Geoffroy's spider monkey (Ateles geoffroyi) Northern brown howler (Alouatta guariba guariba) In case anyone's interested, I've seen nine of these taxa.