Why have gray wolves failed to gain a foothold in Colorado?

From the Aspen Daily Times:

In the early days of October 2020, a soft breeze blew across Cold Spring Mountain, rustling the sagebrush and aspen groves. Three prominent conservationists camped near the weathered land marker that identified the junction of Utah, Colorado and Wyoming, hoping to hear something that had long been absent from this landscape: the howling of a pack of wolves.

Karin Vardaman, who is widely recognized as one of the nation’s experts on wolves, was collecting data for the Working Circle, a nonprofit she founded that works to reduce conflicts between predators and livestock producers. That winter, a wolf pair and as many as four others were spotted in Moffat County, Colorado — the first pack of wolves documented in the state in more than 80 years.

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