National Geographic : 1956 Aug
267 Walter A. Weber Earth-loving Red Ground Monkeys Take to the Trees When Danger Threatens Unlike their cousins of tropical America, African monkeys cannot swing by their tails. Red Ground Monkeys live on the plains and savannas, often venturing miles from the forest's safety. Should a leopard appear, how ever, they frantically seek the protection of trees. Sometimes as many as 50 red monkeys troop together.