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This photo from a 1921 survey of the petrified trees shows some of the large preserved trunks on Specimen Ridge in Yellowstone.
A coyote is pictured in Yellowstone National Park.
Film footage showing damage within Yellowstone National Park after the Hebgen Lake earthquake.
Travis Wyman of the National Park Service collects hair caught in the bark of a tree in Yellowstone National Park. A variety of federal and state agencies collect the grizzly bear hair that's stored at Montana State University.