Howler monkeys Tolkien and Clyde ... The pair are now enjoying spending their golden years in their enclosure at Lympne with two of their sons. The spokesperson said: "The happy couple are ...

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.

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 ...