The fastest bird on Earth is the peregrine falcon. This remarkable bird is known for its high-speed diving ability, reaching speeds of over 240 miles per hour (386 kilometers per hour) while hunting. When it dives, the peregrine falcon folds its wings close to its body, allowing it to slice through the air with minimal resistance. This incredible speed makes it one of the most efficient hunters in the animal kingdom, as it can catch fast-moving prey, primarily birds, mid-flight. Its adaptability and hunting prowess are key factors in its success across various habitats.