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.

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 ...

Half of the endangered Sierra Nevada bighorn sheep appear to have died during this year's record-breaking winter, according to researchers interviewed by LAist. There are now an estimated 360 ...