People envision healthy, natural forests as places full of green trees. This is not accurate. In natural forests, the dead trees are not harvested for firewood, or any other reason. They remain in place, either standing or on the ground, for many years, or many decades. From our vegetation data set of the forest of Powdermill Nature Reserve, we learned that a standing dead tree, called a snag, is sometimes the second or third most common type of tree in a study plot. Each species is tallied separately if alive, all snags are tallied together regardless of species, so all dead trees together are a big number.