More recent population estimates (Festa-Bianchet 2008; Wilson and Mittermeier 2015)
Previous population estimates
Endangered Species Act (US Fish & Wildlife Service)
Habitat and ecological issues
Competitors and predators
Disease and life history challenges
Bighorn sheep populations in the United States and Canada are doing well.
Populations in Mexico are more at risk.
Image credit: © San Diego Zoo Global. All rights reserved.
IUCN website (2002)