They are primarily crepuscular or nocturnal, feeding from late afternoon to early morning and resting during the day. Sometimes they do move around in daylight. When moving slowly, as in grazing or browsing, these animals exhibit an unusual “five-footed” gait, balancing on their tail and forearms while swinging their hind legs forward, then bringing their arms and tail upward. They are remarkably developed in the leaping mode of progression. At a slow pace the leaps usually measure 4 to 6 feet, while at increased speeds they may leap 30 feet or more. Normally they do not jump higher than 5 feet. Speeds of about 30 miles per hour are probably attained for short distances when they are pressed in relatively open country. They can exist for long periods without water. They appear in organized groups called ‘mobs’. Members of adjacent mobs mingle peaceably in overlap zones, but keep mainly to their own undefended ranges. Within each mob males establish a dominance hierarchy through ritualized bouts of pawing, which does not cause injury. Larger males are dominant over smaller ones. This hierarchy functions to determine access to estrous females, and ensures that the fathering of offspring is limited to higher-ranking adult males.