Common ostrich
Behaviour and ecology

Common ostriches normally spend the winter months in pairs or alone. Only 16 percent of common ostrich sightings were of more than two birds. During breeding season and sometimes during extreme rainless periods ostriches live in nomadic groups of five to 100 birds (led by a top hen) that often travel together with other grazing animals, such as zebras or antelopes. Ostriches are diurnal, but may be active on moonlit nights. They are most active early and late in the day. The male common ostrich territory is between two and twenty square kilometres (3 ⁄ 4 and 7 + 3 ⁄ 4 sq mi).

With their acute eyesight and hearing, common ostriches can sense predators such as lions from far away. When being pursued by a predator, they have been known to reach speeds in excess of 70 km/h (40 mph), or possibly 80 km/h (50 mph) and can maintain a steady speed of 50 km/h (30 mph), which makes the common ostrich the world's fastest two-legged animal. When lying down and hiding from predators, the birds lay their heads and necks flat on the ground, making them appear like a mound of earth from a distance, aided by the heat haze in their hot, dry habitat.

When threatened, common ostriches run away, but they can cause serious injury and death with kicks from their powerful legs. Their legs can only kick forward. The kick from an ostrich can yield 225 kgf.
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