The Earth's most successful primates - humans - are on the brink of killing off nearly a quarter of their 625 cousin species, a report has said.BBC News has more on this tragedy.
Of the four global regions inhabited by primates, the worst hit is Madagascar, where loss of habitat to traditional slash-and-burn agriculture has left some lemur species, such as Perrier's sifaka, stranded in tiny areas of the forest.
More than half of Madagascar's lemurs are on the verge of extinction.
"Amazingly, we've managed to get through the 20th Century without any primate species going extinct," Dr Mittermeier said. "I'd like to think this is partly because of better conservation efforts."