With powerful talons and silent flight, harpy eagles are some of the most formidable hunters in the rainforest. In this video ...

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.

A heat wave in Mexico is so fierce that howler monkeys are dropping dead from trees. At least 85 of them have died in Tabasco state as temperatures soar to 113 degrees Fahrenheit and beyond.