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Cute they may be, but ring-tailed lemurs are in deep trouble in Madagascar, according to a report listing the world’s 25 most endangered primates.

According to rough estimates two decades ago, ring-tailed lemurs once numbered “several hundred thousand” throughout the island. But according to a recent census included in the report, numbers have now crashed to between 2500 and 3000.

“It’s so dramatic we felt we had to highlight it,” says lead author , director of conservation at Bristol Zoological Society. “They are the most abundant primate in zoos, but…