“We have seen the resilience of the species, but also know they are still vulnerable.” Once on the brink of extinction, with only about 200 animals in the wild, the population has rebounded to around 4,800. The monkeys, which live only in Brazil’s Atlantic Forest, are still considered endangered. Scientists intervened by vaccinating more than 370 monkeys against yellow fever, using shots adapted from a formula for humans. The animals may also be benefiting from an increase in forest habitat. 

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