Thousands of starlings fly in giant, swirling patterns called murmurations without any leader.

In 2008, physicist Andrea Cavagna studied starling movements in Rome using high-speed cameras. His team discovered that birds do not follow a leader or look at the whole flock. Instead, they use topological interaction. This means every bird tracks exactly six or seven neighbors regardless of how close or far away they are.When one bird changes its path, the information travels through the flock at speeds between 20 and 40 meters per second. This allows the group to turn or dive as if it were one single object. Scientists call this scale-free correlation. It helps the birds stay together even during sudden movements.These patterns are a defense against predators like falcons. The constant shifting makes it difficult for a predator to pick out and strike a single bird. At Gretna Green in Scotland, observers have seen murmurations with 100,000 birds. Even at these high numbers, the birds almost never collide with each other.The birds can perform 180-degree turns in a fraction of a second. This precise coordination is now being used by engineers. They study starling movements to help groups of autonomous drones fly together without crashing.