By the mid-1990s, there were only about 100 Sierra Nevada bighorn sheep left. Conservationists ramped up efforts to save the species, and they were listed as endangered by the state and federal ...

The Sierra Nevada bighorn broke off from their desert bighorn cousins to form a distinct subspecies some 600,000 years ago, according to John Wehausen, who has been studying the Sierra sheep for ...

Mountain lions have also been shown to significantly depress bighorn sheep populations beyond the Sierra Nevada, from New Mexico and Texas to southern Alberta province in Canada.

While bighorn sheep exist in other western mountain ranges, the Sierra Nevada subgroup is genetically distinct -- the remaining 350 sheep are all that remain of the species.

A survivor of three ice ages, the Sierra Nevada Bighorn Sheep, with populations documented living 300,000 years ago, is now on the endangered species list. These majestic animals struggle on in small ...

The high peaks of the southern and central Sierra Nevada are home to a unique and endangered animal, the Sierra Nevada bighorn sheep. John Muir called them “the bravest of all the Sierra ...

More than 400,000 acres of wildlands in the Eastern Sierra Nevada should be made protected habitat for an endangered mountain sheep rebounding from the threat of extinction, the federal government ...

Tom Stephenson, who leads the Sierra Nevada Bighorn Sheep Recovery Program, said the number of ewes, or female sheep, counted this summer is about the same as the previous summer.. Plus, he said ...

Snow cover in the Sierra Nevada is expected to shrink overall as the climate warms, but avalanche frequency could remain the same or even increase at high elevations. That's bad news for bighorn ...

The high peaks of the southern and central Sierra Nevada are home to a unique and endangered animal, the Sierra Nevada bighorn sheep. John Muir called them “the bravest of ...