After running a few tests, the vet confirmed that the animals had been drugged in broad daylight, in one of Rio’s most popular green spaces. This tactic is often employed by poachers to sell ...

This story appears in the December 2017 issue of National Geographic magazine. A downpour during the night had turned the greenish water of Río Quendeque angry and red with fresh mud, and the ...

The study indicates that the species enjoys robust local support among the general population, but a small group of local poachers has been effective in driving the species to the brink of extinction.