Sculpted by the elements, Grand Canyon National Park is a high-rise haven and the world's most famous natural wonder. At every elevation, the park's wild inhabitants carve out a niche that gives them an edge.

Yosemite National Park rises from lush valley floors to soaring alpine peaks, with more than 400 animal species trying to survive in the California oasis.

Big Bend National Park is a vast wilderness of mountains, deserts and rivers deep in the heart of Texas, with more species of birds, insects and cacti than any other park in the United States.

Badlands National Park in South Dakota is a land of rugged beauty, home to a sea of grass, rocky spires and some of America's most iconic species.

Hawai'i Volcanoes National Park is a sacred land born of fire and sea, home to some of the most unique assemblage of species anywhere on the planet.