Not sure how many, but I think it is a bunch of them. There are a large number of trees that have been stripped of the bark. Some branches are definitely dead. No one lives at our farm so the animals just do as they please. I did see one large porcupine really early this morning. I might have to ask the neighbour to get rid of them. They don't seem to touch the polpular trees, only the spruce & maples. All have damage in the yard