Structure and composition of vegetation in
old-growth and managed forests. Birds typically nesting within
certain habitats are listed below the habitat. Triangular-shaped
canopies represent fir trees (Douglas-fir in the overstory; grand
fir in the understory). Oval-shaped canopies represent Ponderosa
pine, and straight lines delineate standing snags. (From:
Mannan and Meslow, 1984).