One day I watched as two sqs. were scrounging for an acorn in a very large oak that was devoid of leaves. Yes, a hawk attacked and it was like a cartoon as all three must of hit every limb and branch, trying to escape, and trying to obtain a meal. I would guess this took place in a minute, when a sq.was comfortable enough to bail out for the ground. The hawk went after him, missed, and the hawk gave it up, flying away. Another time, I heard a crash in the leaves and watched as a hawk flew up from the scene, and landed in a tree twenty or so feet away on a limb same height as my stand. I watched as he pulled apart and ate an entire chipmonk--head, tail, and feet. Oh what fun we have, while others think we are cuckoo for spending alone time in a tree, while awaiting for whitetail to come along