But what was really interesting, and took me much longer to figure out, was that the hawk always attacked when the car queue was long enough to provide cover all the way to the small tree, and that only happened after someone had pressed the pedestrian crossing button. As soon as the sound signal was activated, the raptor would fly from somewhere into the small tree, wait for the cars to line up, and then strike.
That meant that the hawk understood the connection between the sound and the eventual car queue length. The bird also had to have a good mental map of the place, because when the car queue reached its tree, the raptor could no longer see the place where its prey was and had to get there by memory.
It was an immature bird. Cooper’s hawks rarely nest in cities in our area but are common winter visitors. So the bird I was watching was almost certainly a migrant, having moved to the city just a few weeks earlier. And it had already figured out how to use traffic signals and patterns. To me it seemed very impressive.
Emphasis mine. That’s wild!