Ostrich

The world's largest living bird — flightless, two-toed, capable of running at 70 km/h, laying the largest eggs of any bird, and producing meat increasingly farmed across the globe.

The largest bird

The ostrich is the largest and heaviest living bird by all measures:

Height — up to 2.7 m (males)
Weight — up to 160 kg
Egg size — about 1.5 kg, equivalent to 24 chicken eggs
Stride length — 3-5 meters when running
Sustained running speed — 50 km/h easily, peaking at 70 km/h for short bursts

This makes the ostrich the fastest two-legged animal on Earth (faster than any human, including world-record sprinters at peak).

Two-toed feet

Most birds have four toes; ostriches have only two toes per foot — a unique trait among birds. The reduced toe count is a running adaptation, similar to how horses have a single toe (hoof). The larger toe carries most of the weight; the smaller toe provides balance.

The hard, claw-like toes can deliver lethal kicks. An ostrich kick can disembowel a lion or kill a human — they’re among the few birds with documented fatal attacks on people.

Largest eggs

Ostrich eggs are the largest single cells in the modern world (eggs are technically single cells before fertilization). A typical ostrich egg:

Weighs 1.4–1.8 kg
Has a shell 2 mm thick — strong enough to support a person’s weight
Takes 42 days to incubate
Equals 20+ chicken eggs in volume

Ostrich eggs were eaten by humans for millennia. They’re still farmed for both meat and eggshell artwork (the empty shells are decorated as ornaments and sold as souvenirs).

Head-in-sand myth

The folk belief that ostriches “bury their heads in the sand” when frightened is false. The myth probably comes from observing ostriches lower their heads to ground level when threatened — flattening to the ground for camouflage rather than burying themselves.

When actually threatened, ostriches either run (their primary defense, given the speed) or kick. They never bury their heads in the sand.

Commercial farming

Ostrich meat — leaner than beef, with similar protein content — is increasingly farmed worldwide. South Africa pioneered modern ostrich farming in the 19th century, originally for the feather trade. Today, commercial ostriches are raised on every continent except Antarctica, providing meat, eggs, leather, and feathers.

Other ratites

Ostriches belong to the ratite group — flightless birds with flat breastbones (lacking the keel that anchors flight muscles in flying birds). Other ratites: emu (Australia), rhea (South America), cassowary (New Guinea/Australia), kiwi (New Zealand). All evolved from flying ancestors but lost flight independently.