20 Animal Journeys That Still Defy Explanation

A caribou migration can look organized from a distance, like one huge creature flowing across the tundra. Up close, the order is more interesting. No single animal is holding a map for everyone else. Movement emerges through group behavior, environmental signals, memory, snow conditions, insects, food availability, and the constant responses of individuals to one another. That collective decision-making gives the herd flexibility. If conditions shift, the motion can shift too.