Traditionally, conservationists estimate gorilla numbers by counting nests and examining the dung outside each one. This method showsed 336 gorillas left in specific 331-square-kilometre national park. But when Guschanski’s team analysed DNA samples from each pile of dung using a new genetic counting method, the population estimate dropped by 10 per cent to 302. This suggests that some individuals had been counted twice using the old technique.
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