American Bison (Bison bison) - These iconic mammals can weigh up to 2,000 pounds (900 kg) and stand over 6 feet tall at the shoulder
Moose (Alces alces) - Found in northern regions of the US, moose are the largest members of the deer family, with males (bulls) weighing up to 1,500 pounds (680 kg)
Grizzly Bear (Ursus arctos horribilis) - Among the largest carnivores in North America, male grizzlies can weigh up to 1,500 pounds (680 kg) and stand over 7 feet tall
American Alligator (Alligator mississippiensis) - Native to the southeastern US, these reptiles can exceed 12 feet in length and weigh up to 1,000 pounds (450 kg)
Gray Wolf (Canis lupus) - Although not as large as some other predators, male gray wolves can weigh up to 130 pounds (59 kg) and stand over 3 feet tall at the shoulder
Elk (Cervus canadensis) - Found in western states, male elk (bulls) can weigh up to 1,000 pounds (450 kg) and stand over 5 feet tall at the shoulder
Humpback Whale (Megaptera novaeangliae) - Along the Pacific and Atlantic coasts, humpback whales can reach lengths of 50 feet (15 meters) and weigh up to 40 tons (36,000 kg)
Blue Whale (Balaenoptera musculus) - The largest animal on Earth, blue whales can grow up to 100 feet (30 meters) long and weigh over 200 tons (180,000 kg)