Harris’s hawks are the only raptors known to hunt cooperatively. Falconers have only started taking advantage of this in the past few decades. The fact that early reports of groups of these hawks shared kills was originally taken as meaning that they were behaviorally like vultures. The actual situation turned out to be much more interesting. Here’s a picture of our three birds at the end of 2002, Rusty with the two males we had trapped about five weeks earlier.
Fuji S2 Pro, Nikkor G 70-300mm.