Since September, 153 river dolphins have been found dead in and around Lake Tefé, in the heart of the Brazilian Amazon. That's 10% of the entire local dolphin population. Researchers are trying to figure out exactly what is causing the deaths, but it's likely tied to record-setting drought in the region - the worst in a century. The FRANCE 24 Observers team spoke to Danny Tredgido, one of the scientists studying the problem.


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