With a known population of only 110 individuals,the cao vit gibbon,also named eastern black crested gibbon,is one of the rarest ape species in the world,second only to its closest relative the Hainan gibbon.They were once considered distinct in the 1960s,but were rediscovered along the northern border of Vietnam in 2002.According to an updated survey conducted by the research team of Fauna and Flora International’s
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