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National parks represent our country’s last stronghold of wilderness. But the large majority of parks are suffering, too.

Ninety-five percent of parks assessed in a recent study have lost key species that once helped define them. Meanwhile, 91 percent of parks that protect cultural or historical resources were in fair or poor condition.

• Of 61 parks evaluated for their natural resources, more than 80 percent were rated either “poor” or “fair.”
• Only three made the “excellent” grade: Little Bighorn Battlefield National Monument in Montana, and Alaska’s Lake Clark National Park and Preserve and Denali National Park and Preserve.

Full story at Discovery News.

More news from Discovery Communications.