Private Joseph Fields saw several bighorn sheep near the
Yellowstone River and picked up a curved horn to bring back
to camp. A favorite of trophy hunters, bighorn sheep declined
dramatically in the 19th century, from 200,000 to several
thousand. Increasing populations of domestic sheep passed
on psoroptic scabies, among other diseases, while exotic grasses
and fire suppression changed their habitat. Reintroductions
have helped some extirpated populations regain a foothold.
State species of concern; one subspecies is Federally endangered.,
and one is extinct.