Bob Caesar called my attention to this story story in the Jackson Hole News and Guide.
Cougars die from Plague by Cory Hatch.
A mother cougar and her kitten died of plague. Two other cougars were found dead of the plague. This is rare in Wyoming, plague being more of a threat in the Southwest, but it not as uncommon as thought. Five people have died of plague in Wyoming since 1978, according to the article.