Monkeys ‘falling out of trees like apples’ in Mexico amid brutal heatwave

It's so hot in Mexico that howler monkeys are falling dead from the trees.

At least 83 of the midsize primates, who are known for their roaring vocal calls, were found dead in the Gulf coast state of Tabasco. Others were rescued by residents, including five that were rushed to a local veterinarian who battled to save them.

"They arrived in critical condition, with dehydration and fever," said Dr Sergio Valenzuela. "They were as limp as rags. It was heatstroke."

While Mexico's brutal heatwave has been linked to the deaths of at least 26 people since March, veterinarians and rescuers say it has killed dozens and perhaps hundreds of howler monkeys.

In the town of Tecolutilla, Tabasco, the dead monkeys started appearing on Friday, when a local volunteer fire-and-rescue squad showed up with five of the creatures in the bed of the truck.

Valenzuela put ice on their limp little hands and feet, and hooked them up to IV drips.

So far, the monkeys appear to be on the mend. Once listless and easily handled, they are now in cages at Valenzuela's office. "They're recovering. They're aggressive ... they're biting again," he said, noting that was a healthy sign for the usually furtive creatures.