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Snag - After a standing symplastless tree has decayed to the point where most of the branches have fallen, it is called a snag if it is at least 20 feet tall, a stub if shorter. The soft, punky snag or stub in the final stages of decay is used as a foraging site by many insectivorous birds, and as a nest site by black-capped chickadees (Parus atricapillus), that do not chisel cavities as woodpeckers do, but merely pick out the soft punk to form a cavity. (In the Northeastern USA.)

See - Managing Cavity Trees for Wildlife in the Northeast