Back a few years ago, I had an oak tree fall against this much small tree. Were the tree hit, a large chunk of the bark was taken off. Well, I left it, not knowing what to do.
Well, just today, I noticed that something has been eating the tree, with these big holes. It seems to have happened recently, as I have not noticed it before and there are still some wood pieces on the ground. It could be a woodpecker or something. What did this and is there any way to help the tree. the wound seems pretty deep, but less than half of the depth of the trunk. The trunk is about 8" in diameter. You can see where the bark was beginning to form around the scraped area.
Here is a link to a picture:
Tom