When bats emerge from caves to forage at night, they fly in a dense column, snaking through the air for several miles until breaking apart to feed. Kunz and a former postdoc, Nickolay Hristov, are reconstructing bat flight patterns to understand how and why this happens. They've learned that bats fly at an average speed of 20 mph, and their behavior is actually not as complex as it looks. Think of cars driving on a highway: "If you are sitting in the middle, it looks intimidating. But when you are in the traffic, it becomes an individual balancing act," Hristov said.