Hyaenas were long said to be cowardly scavengers, but they kill as much as 95% of the food they eat (especially spotted hyaenas). They can drive off leopards or lionesses from their kills. Hyenas are mostly nocturnal animals, but may leave their lairs in the early morning. Except for the very social spotted hyaena, hyenas are generally not gregarious animals, though they may live in family groups and come together at kills.