Bighorners are mutated Bighorn sheep that can be found throughout the wastelend mainly within the Zion valley, generally around water sources and plants such as Razor grain. Several settlements, have domesticated them for a source of fresh meat, hides, and horns, but wild herds can be found in mountainous regions. usually in close proximity to eddible plants. This makes them rather instrumental in herb tracking, Several settlements use bighorners in this way to survive.

Bighorners are herbivorous primarily found in wild herds of three to seven in the Wasteland and larger herds in the Zion valley, or in domesticated drifts of varying size in settlements. Bighorners are communal animals, and as such, if one member of the herd is distressed, the entire herd becomes highly aggressive. Despite this they are generally calm beasts with surprisingly docile dispositions. Despite their large builds they cannot be used as pack animals, as they just lie down refusing to move until you take the pack off.