Source: IFLSCIENCE
Ostriches, the world’s fastest and largest birds, have a unique anatomical feature: four kneecaps—two on each leg. Researchers at the Royal Veterinary College in London explored this unusual setup using biplanar fluoroscopy to study the bones and joint movement of a deceased ostrich. They discovered that the upper kneecap likely helps generate quick, powerful leg extension, aiding the bird’s impressive running speed of up to 69 km/h (43 mph).
The lower kneecap, or distal patella, may serve a protective function, reinforcing the tendon against compression forces during rapid and extreme knee flexion. This adaptation appears to be exclusive to ostriches, potentially explaining their exceptional speed and range of motion. While the study was limited to one specimen, findings suggest that the additional kneecap enhances both performance and durability. In essence, ostriches are biomechanical marvels—swift, powerful, and uniquely equipped for high-speed locomotion, leaving most humans (including Usain Bolt) in their dust.
Read the full story HERE: https://www.iflscience.com/why-do-ostriches-have-four-kneecaps-if-they-only-have-two-legs-79324