That means that 20,000 calories of just moths per day can be consumed by a rock-turning grizzly bear. A single moth has a high enough fat content that it accounts for as much as a half a calorie. While fat in the diet is not the best thing for humans, it is important to bears. It is estimated that some 40,000 moths per day can end up in the stomach of a hungry bear. The bears will dig through the slide rock and eat the moths that they uncover. Moth Deposit PhotosĪt these places of slide rock and sunshine, both grizzly and black bears gather each year, climbing high above timberline to feed on the moths. These moths come from farmland many miles away to these high, remote mountain slopes in Yellowstone. Researchers are just now starting to understand the intricate relationship between this supposed pest and bears, but their relationship is very important.Įach summer, moths of the army cutworm fly into tall mountain rocky slides, where they burrow away from the intense mountain sunlight into dark crevices.
The most common moth in the West is called the miller, and it is the adult of the army cutworm.
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