The patas male plays a role that is well suited to the open country where the group is exposed to attack by leopards and hyenas. He acts as a watchdog, standing on two feet to peer over the tall grass, sometimes using his tail as a tripod, or climbing into an isolated tree to spy out the land. If he sees a predator, he utters no noisy alarm bark, just a soft chirruping call that alerts the group. Then they crouch silently in the grass, remaining concealed while the male performs a conspicuous diversionary display. Bouncing noisily about in the branches of his tree, he rushes off in the opposite direction, giving time for the females and young of the group to make their escape.
Surplus males live in separate bands.
Several of them will occasionally approach a troop of females and set about their single male in an attempt to drive him away and take his place. Such incidents are quite frequent and biologically desirable in that they prevent inbreeding. The patas can climb small trees when alarmed but usually rely on their speed on the ground to escape from danger. They have been seen many miles from water, therefore they probably can exist under semi arid conditions. These monkeys are alert and seldom permit close approach.