WHAT IS LEFT:
Lavasoa Mountains dwarf lemur — unknown
Lake Alaotra bamboo lemur — about 2,500-5,000
Red ruffed lemur — unknown
Northern sportive lemur — around 50
Perrier’s sifaka — 1,700-2,600
Rondo dwarf galago — unknown but remaining habitat is just 100 square kilometres (40 square miles)
Roloway monkey — unknown but thought to be on the very verge of extinction
Preuss’ red colobus monkey — unknown
Tana River red colobus monkey — 1,000 and declining
Grauer’s gorilla — 2,000-10,000
Philippine tarsier — unknown
Javan slow loris — unknown
Pig-tailed langur — 3,300
Cat Ba langur (golden headed langur) — 60
Delacour’s langur — 234-275
Tonkin snub-nosed monkey — less than 250
Kashmir grey langur — unknown
Western purple-faced langur — unknown
Hainan gibbon — 25
Sumatran orangutan — 6,600
Ka’apor capuchin — unknown
San Martin titi monkey — unknown
Northern brown howler monkey — less than 250 mature animals
Colombian brown spider monkey — unknown
Ecuadorian brown-headed spider monkey — unknown
Only one primate species needs to go extinct in order to save the rest.