Regarding an animal walking backwards, I agree thirty yards is not natural but I don't doubt it. If you meet your dog in a narrow hallway he'll walk backwards a few steps to get out of the way, etc. but thirty yards is a long ways. I've always got a kick out of hearing stories of the deer trackers on snow telling about how when tracking a smart old buck the deer would place his hoofs inside his other footprints, walk backwards and then leap off to the side to try to shake the tracker. Give me a break. In reality what happens is the hunter is tracking the buck, pushing him somewhat. The deer is being pushed into unknown territory ahead. He sees/hears something ahead of him that he questions, a movement or whatever. He stops and watches, then questioning his advancement he backs up a few steps and leaps to one side or the other then continues on. Reading anything more into these tracks written in the snow is pure imagination in my opinion but makes for a good story whether the tracker ultimately gets the buck or not. BW