ABSAROKA RANGE — Andy Pils was silent as he scanned with his Vortex spotting scope, its lens focused on a steep, talus-covered mountainside some 2.5 miles away. Two weeks before, 10 grizzly bears were ...

More grizzly bears are congregating each summer on steep rocky slopes in search of army cutworm moths in the southeastern portion of the more than 9,210-square-mile Greater Yellowstone Ecosystem.

OUTSIDE OF MEETEETSE, Wyo. — High above the trees, in the rocky slopes of the Absarokas, one-calorie morsels scurried from the light. They crawled under rocks and in dark shadows. The army cutworm ...

The health of the Greater Yellowstone grizzly population is up for debate, with some calling for the bears to be taken off the endangered species list, while a few scientists claim their numbers may ...

Army cutworm moths have been known as a grizzly food source in the Greater Yellowstone Ecosystem since the 1980s, but the ecology has been poorly understood, in part because the insects congregate in ...

More grizzly bears are congregating each summer on steep rocky slopes in search of army cutworm moths in the southeastern portion of the more than 9,210-square-mile Greater Yellowstone Ecosystem.

Andy Pils was silent as he scanned with his Vortex spotting scope, its lens focused on a steep, talus-covered mountainside some 2.5 miles away. Two weeks before, 10 grizzly bears were clustered ...