My dog just did her usual run out the door to chase squirrels. Nothing ever happens but her running out and staring up at treetops watching them swing from tree to tree. This time I saw what I thought was a chunk of dead limb falling and loudly thudding to the ground, I walked out to examine it while thinking I'm glad I wasn't standing there, but there was nothing there, so I think I just witnessed a squirrel fall from incredibly high up, thud on the ground and then run away. Poor thing...