An ostrich is a large, flightless bird native to Africa. These birds are the largest living species of bird and can grow up to 9 feet tall and weigh up to 320 pounds. Ostriches have long legs and can run at speeds of up to 40 miles per hour. They possess two toes on each foot, compared to most birds which have four. Ostriches are omnivores, consuming a wide range of plant and animal material. They feed on seeds, grasses, flowers, leaves, roots, and insects. They also eat lizards, snakes, and small mammals. Ostriches are social animals that live in groups of 5 to 50 birds. They display complex behaviors including mating rituals and aggression. In the wild, their lifespan is estimated at up to 40 years. In captivity, they may live even longer. Ostriches have long been kept as livestock.