The Eastern Cougar Is Officially Extinct - Atlas Obscura
Local Mountain Lion Population Faces Precipitous Decline in Genetic Diversity Within 50 Years, Possible Extinction - Santa Monica Mountains National Recreation Area (U.S. National Park Service)
The eastern puma is declared officially extinct | Daily Mail Online
Pumas, Panthers & Cougars: Facts About America's Big Cats | Live Science
How We're Helping Protect Endangered Florida Panthers