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Accumulation of cone scales around the base of an 18-inch d.b.h. white spruce is the result of squirrel activity. The debris favors deep burning at the bases of trees. Used as illustration, Fig. 5, Pg. 19, USDA Tech Bull 1133, 1956.
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Collection: Pacific Northwest Research Station, Alaska Image Archive
Keywords: damage by animals
Location: Alaska
Description: Accumulation of cone scales around the base of an 18-inch d.b.h. white spruce is the result of squirrel activity. The debris favors deep burning at the bases of trees. Used as illustration, Fig. 5, Pg. 19, USDA Tech Bull 1133, 1956.
Date: 1956

https://www.fs.usda.gov/rds/imagedb/results?collection=Pacific+Northwest+Research+Station%2C+Alaska+Image+Archive&keyword%5B%5D=damage+by+animals&photog%5B0%5D=Lutz%2C+Harold+J.