A monkey descending a tree trunk often keeps its head up, moving almost like a cautious climber backing down a ladder. Squirrels and many other mammals, by contrast, tend to go headfirst.

A monkey at the top of a tree in Africa seemed to have no way of escaping a leopard that had climbed halfway up the tree and was closing in. But the monkey had a clever plan. The monkey outsmarted the ...

Researchers have shed new light on the features that enable tree-dwelling mammals to move effectively through their environments, providing insights into the evolution of the distinct upright postures ...