They can be found in spruce, aspen and willow forests throughout the northern United States and Canada, but Alaska's Denali National Park is one of the best places to spot them.
The hawksbill sea turtle, a critically endangered marine reptile that feeds on jellyfish, seaweed and small crustaceans can be found in Hawaiʻi Volcanoes National Park.
Thanks to the work of conservationists, the bald eagle is relatively easy to spot at parks across the northern U.S., including Acadia National Park.
While the vast majority of the United States' grizzly population lives in the wilderness of Alaska, Montana's Glacier National Park is home to the largest concentration in the Lower 48.
If you want to see an American alligator in the wild, your best option is in Florida's Everglades National Park.
The Olympic marmot, a cat-sized rodent, is found exclusively in the mountain meadows of Olympic National Park.
While it's possible to spot these canines in many US national parks, you're guaranteed to see one when you visit the Grizzly and Wolf Discovery Center in Yellowstone National Park.
Look for these surefooted beasts scaling hillsides and the steep cliffs of the Rocky Mountain Range, including in Rocky Mountain National Park and Utah's Zion National Park.
The Great Smoky Mountains National Park is nicknamed the "Salamander Capital of the World" for the 30 species from five families that live there.
The American bison is the heaviest land mammal native to North America and can be found in Badlands National Park, Theodore Roosevelt National Park and Grand Teton National Park.