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 ...

A pair of loving monkeys will mark their 17th anniversary together on Valentine's day. Howler monkeys Tolkien and Clyde, have four children, spend all their time together and cuddle using their ...

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 ...

With the likes of jaguars and howler monkeys in the vicinity, the central courtyard offers a calm space in the midst of an untamed ecosystem. An expansive roof structure shelters the house from ...

Far up a giant Amazon jungle tree, a large howler monkey walked among the branches. As it stepped from branch to branch, its long tail would wrap around a convenient ...

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 ...

In the middle of the food chain were animals like howler monkeys which ruled the treetops protecting their territory with their signature calls. Things are quite different now. Life on these ...

An ongoing study of the cause of death of howler monkeys on Barro Colorado has identified the howler monkey bot fly Cuterebra baeri as the single most important factor. Very young monkeys are 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.