Black Bear Cambium Feeding in Ontario?

Many current and former Earth Tracks Tracking Apprenticeship apprentices were participating at a recent Track and Sign certification in Parry Sound, where a good tall triangular section of bark was missing and the remaining bark had begun lobing over towards the exposed wood. The cambium layer was missing. This wound seemed to have occurred a while ago, and, as noted above, the tree was healing as the remaining bark was enclosing the wound. Was this Black Bear feeding sign?
Read on for a closer look at this unusual sign on this side of the continent.