One might think an animal may have done this but it was some loggers and their equipment.

In the middle of a 90+ acre wood lie rock walls of impressive scope and detail. Perhaps a hundred years ago these walls separated cleared farmland from the forest primeval. Or, perhaps, residents were so interested in marking their property that they spent hours of effort to build walls among the woods?

The first part of spring in Maine is the greening of the moss. Here, an old-age tree trunk gets a revived carpet of moss.