This story originally appeared on WIRED en Español and has been translated from Spanish.
Brown howler monkeys are dropping dead by the dozens in southern Mexico. Between May 4 and May 21, at least 138 died, with deaths occurring in places where temperatures have been abnormally high, exceeding 43 degrees Celsius (109 degrees Fahrenheit).
Before perishing, the animals suffered convulsions, hyperthermia, and fainting, which are symptoms of dehydration. Organizations responding to the catastrophe note that the main cause of death seems to be heat stroke, although they haven’t ruled out other factors. Deaths have been reported across the state of Tabasco.
“The feeling of the work team is tragic, it is painful,”
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