21/08/2026
The ostrich is the world’s largest living bird and, like other flightless birds, has anatomical adaptations suited to life on the ground. Unlike most flying birds, its sternum lacks the prominent keel (carina) that provides a broad attachment area for the powerful pectoral muscles used in flight.
However, the absence of a keel alone does not explain its flightlessness; ostriches also have relatively reduced flight musculature, modified wings, and a body plan strongly specialized for running. Their powerful, long legs and two-toed feet enable them to reach speeds of around 72 km/h (45 mph), making running their primary form of rapid locomotion.