Snag (forest ecology)- a standing, dead or dying, tree often missing a top and/or smaller branches.
Snags provide essential habitat for many species, such as woodpeckers that feed on insects dwelling in decomposing wood.Snags also provide good lookout towers for flycatchers and raptors and provide essential habitats for some amphibians, reptiles and mammals. Snags are used for nesting, shelter and feeding sites. The snags of some large conifers can remain intact for 100 years or more, becoming progressively shorter with age, while other snags with rapidly decaying wood break up and collapse in 2–10 years.
Some of the most visible snags at IslandWood can be found in Cattail Marsh. Marsh snags are often the result of past flooding that killed trees around the edges of the wetland.