Puma That Vanished from U.S. East Coast 80 Years Ago Sadly Declared Extinct
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)
Eastern cougar declared extinct, but whether it ever existed is a question | CBC News
WNC's native pumas were elusive, powerful | Nature Center Notes
Puma Power | Defenders of Wildlife
U.S. authorities declare Eastern puma extinct, 80 years after last sighting