Have you ever seen a group of pigeons explode into flight or flying back and forth in a panic? When I’m walking around or driving through Chicago, I sometimes see pigeons launch into flight for no obvious reason. More often than not the source of their disturbance turns out to be a bird of prey, like a Cooper’s Hawk or Peregrine Falcon. The pigeons are smart enough to recognize the threat a hawk presents and they respond to that threat by getting up and flying around. This predator response is the same for other birds, like shorebirds or gulls that flush at the sight of a hawk, falcon, or other large bird of prey. So the next time you see a flock of pigeons explode into flight, look around, there might be a Peregrine Falcon or Red-tailed Hawk behind or above them.
Whoever said pigeons were useless was wrong.