Monkey business will no longer be conducted in trees: Global deforestation is driving dozens of species of monkeys and lemurs out of trees, where they normally feed and sleep, according to a new study published in the Proceedings of the National Academy of Sciences (PNAS) on Monday. Dozens of species are now adapting to living and hunting on the ground in the Americas and Madagascar. Higher temperatures, a decrease in canopy cover, a dietary shift away from fruits and larger group sizes all contributed to these critters moving to the ground.