This happened while I was a boy hunting for squirlle when I was a boy. I was moving slowly through the woods and watching the trees. I got close to a crow on a branch above me. As I watched another crow flew down and it looked like he glanced off his head like a fly by, . With that the crow fell to the ground and like an apple. no movement no fluttering. I made my way the 20 or so feet to inspected it and it was stone dead. I wondered if he was a sentry and I made my way into the rookery and the boss wacked him for neglegent behavior and sleeping on the job. All other crows left in a hurry. Damndest thing I ever saw. JB
