Moose can be found in several northern American national parks, including Wyoming's Grand Teton and Yellowstone, Michigan's Isle Royale, and Alaska's Denali National Park.
In the wild, the greatest sites to see them are Florida's Everglades National Park and other sections of southeastern America.
The Olympic marmot is a must-see for visitors to Washington state's UNESCO-recognized Olympic Peninsula.
Bighorn sheep are found in Colorado's Rocky Mountain National Park and are known for, you got it, their huge curled horns.
The American bison, named America's national mammal by President Obama in 2016, is the largest land animal in the country, with some weighing more than a ton (907kg).
Rarely are animals as iconic as the bald eagle. The US national emblem since 1782, this yellow-beaked, white-headed bird is native to North America and found in many national parks.
If you're lucky, you can see hawksbill turtles in Hawaii's Volcanoes National Park. Only 10 to 25 females nest off Hawaii each year, but bigger populations live in Australia and the Solomon Islands.
The Great Smoky Mountains National Park, which spans North Carolina and Tennessee, is known as the "Salamander Capital of the World" because of its profusion of these strange creatures.
California condors, the biggest flying bird in North America with a wingspan of up to 10 feet (3m), were nearly extinct in the 1980s, with only 22 remaining.
Pronghorn, sometimes known as American antelopes (a misnomer because actual antelopes do not exist in North America), are abundant in Yellowstone National Park.