Federal prosecutors said creating hybrid animals is "unnatural," yet the practice is common in the game industry.

“Bighorn sheep are susceptible to disease from domestic sheep ... “To learn more about how big of an issue this could be, or even where it’s coming from definitively, we really need more ...

After surmounting its first threats—diseases from and overgrazing by domestic sheep settlers introduced ... they don't have enough forage. And in the big winters, they die of starvation and ...

Although they once populated the High Sierra by the thousands, European settlement of the West brought domestic sheep and other threats to the bighorns' habitat, and the species is thought to have ...