For 25 years, Adolph Murie, one of North America’s greatest naturalists, spent his summers in Mount McKinley National Park (since renamed Denali National Park) tracking, recording, and interpreting the lives of grizzlies in one of their few remaining strongholds.

For 25 years, Adolph Murie, one of North America’s greatest naturalists, spent his summers in Mount McKinley National Park (since renamed Denali National Park) tracking, recording, and interpreting the lives of grizzlies in one of their few remaining strongholds.