Spanning over 60,000 acres, the Morenci copper mine in eastern Arizona — one of the largest-open-pit mines in the world — produces hundreds of millions of tons of copper ore each year. But the steep ...

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She was released the next day and rejoined her herd in good health Colorado wildlife officials are sharing details of a dramatic cold-weather rescue after a Rocky Mountain bighorn sheep fell through ...

Like the majority of Colorado’s big game species, the success of Rocky Mountain bighorn sheep is up against habitat loss and disturbances, a changing climate and growing recreation and human pressure.

The Colorado state mammal springs up near-vertical cliff faces with ease, thanks to specialized hooves. Rocky Mountain Bighorn Sheep have modified toenails that can snag little protrusions, and soft, ...

A new Idaho study has identified six distinct genetic groups of Rocky Mountain bighorn sheep across the state, opening new doors for management and reintroduction projects. Examining DNA from horn ...

RIVERTON — Four decades ago, Fremont County was home to the largest herd of Rocky Mountain bighorn sheep in the lower 48 states — an estimated 2,500 animals. By the early 1990s, disease — particularly ...

Researchers studying Rocky Mountain bighorn sheep on Antelope Island in Utah have found that data from GPS collars can help estimate when a pregnant female is about to give birth, without requiring ...