in the nature preserve this afternoon a bit of drama with Black-billed Magpies: I have come to learn that if I see more than 4 or 5 in a tree - squawking - and dive bombing in and out, they are usually harassing something - and usually it is a hawk that they are ganging up on; in this case I watched them go after - what I suggest is a Sharp-shinned Hawk (see in other observation); but you can see the Hawk (smaller than the Magpie) in the last image. The Hawk went after one Magpie - not to take down as prey, but in self-defense. As you will see in last image - the Accipiter - is now going after the Magpie; it was an ongoing thing for about 20 minutes....