Gilberto Pozo, a biologist, was monitoring a small forest in the town of Cunduacán, in southern Mexico, in early May when two mantled howler monkeys fell from a tree in front of him with a thud. But, as temperatures soared over 100 degrees Fahrenheit in recent weeks, dozens of reports of dead monkeys started popping up. Residents were finding groups of 10 or more dead at a time, many also showing signs of dehydration. As of Wednesday, 147 monkeys have died in the states of Tabasco and Chiapas in southern Mexico. The deaths of dozens of mantled howler monkeys in Mexico may be the latest sign of the danger extreme temperatures pose to wildlife around the world.

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Persons: Gilberto Pozo, “, ”, Pozo Locations: Cunduacán, Mexico, Tabasco, Chiapas