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POPSGorilla 'mother lode' found in Congo I can't help thinking that they are there, because we didn't know about them, but there are other species that have been downgraded from critically endangered to endangered due to conservation efforts. However the International Union for Conservation of Nature (IUCN) found that 48% of the 634 known species and sub-species of primates, humankind's closest relatives such as chimpanzees, orangutans, gibbons and lemurs, are at risk of extinction. Primates are suffering most in Asia, with 71% of all species at risk, against 37% in Africa.