What do adult ostriches primarily eat?

The common ostrich, or simply ostrich, is a species of large flightless bird native to certain large areas of Africa. It lives in nomadic groups of 5 to 50 birds. When threatened, the ostrich will either hide itself by lying flat against the ground, or run away. If cornered, it can attack with a kick of its powerful legs. Mating patterns differ by geographical region, but territorial males fight for a harem of two to seven females.

The common ostrich's diet consists mainly of plant matter. They mainly feed on seeds, shrubs, grass, fruit and flowers. Lacking teeth, they swallow pebbles that act as gastroliths to grind food in the gizzard. When eating, they will fill their gullet with food, which is in turn passed down their esophagus in the form of a ball called a bolus.