I left a jar of sealed peanut butter at this X as well as 3 sets of 3 apples at locations where I normally leave snacks. 2 pieces of bark where I leave apples were intact and balanced on 2 different downed trees just like I left them apples last time. Seems like delicate work for a bear. This is the 3rd time I've seen this The rest is on my camcorder. I'll have to make a small video and see if I captured the knock.