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Monitoring cougar in Yosemite Valley Difficult San Mateo County Times June 22, 2008.

Lack of predators harms wild lands San Mateo County Times June 21, 2008.

Cougar decline resuls in critical changes to Yosemite ecosystem Land Letter - E&E Publishing Service May 8, 2008.

Yosemite: Protected but Not Preserved. Science Magazine May 2, 2008.

How humans, vanishing cougars changed Yosemite San Francisco Chronicle May 2, 2008.

It All Falls Down: A plummeting cougar population alters the ecosystem at Zion National Park. Smithsonian Magazine/Smithsonian.com December, 2006.

Cougar Predation Key To Ecosystem Health. ScienceDaily.com / University of Toronto October 25, 2006.



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