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- The most common moth in the west is called the miller, and it is the adult of the army cutworm. Researchers are just now starting to understand the intricate relationship between this supposed-pest and bears, but that relationship is very important.
Each summer, moths of the army cutworm fly into tall mountain rocky slides, where they burrow away from the intense mountain sunlight into dark crevices. Hundreds of thousands of them. These moths come from farmland many miles away to these high, remote mountain slopes in Yellowstone.