Harold Von ...

Howler monkeys may be the size of a small dog, but they make a very loud sound. Their low-pitched noises can reach 140 ...

They can use this tail as an extra arm to grip or even hang from branches—no Old World monkeys have such a tail. A gripping tail is particularly helpful to howler monkeys because they rarely ...

These are mantled howler monkeys in Costa Rica. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the ...

My adventure of a lifetime began in 2015 when I was asked to follow the tree-top lives of Costa Rica’s gravity-defying howler monkeys (Alouatta palliata palliata). Image by Justine Allan.

According to the fifth census of Mantled Howler Monkeys, Alouatta palliata, on Barro Colorado Island in Panama, monkey numbers have changed little since the late 1970s. Disclaimer: AAAS and ...

It’s so hot in Mexico that howler monkeys are falling dead from the trees. At least 138 of the midsize primates, who are known for their roaring vocal calls, were found dead in the Gulf coast ...

I have looked a silverback mountain gorilla in the eye and lived to tell the tale. Could there be an experience so ...

MEXICO CITY--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 ...

Monte, the Birmingham Zoo's resident male black howler monkey, is set to have a very special Father's Day weekend. Late last week, he and his mate Matea welcomed a new baby into the world ...

A rare red howler monkey has been born at a wildlife park in Yorkshire. The primate was born on 29 April at Doncaster's Yorkshire Wildlife Park and keepers said it was still too early to tell the ...