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A “snag” is a dead tree that is still standing, sometimes missing its top and most of the smaller branches. Snags like this provide important habitat for numerous species. Many birds, such as barred owls (Strix varia) and great horned owls (Bubo virginianus), as well as small mammals, use snags for nesting. So critical are snags to wildlife, that foresters sometimes create snags by killing trees and leaving them standing.