Largest Land Mammals in North America
North America is home to some massive animals — descendants of a continent that, until fairly recently, also hosted mammoths and giant ground sloths. Here are the ten heaviest land mammals still roaming the continent today, ranked by maximum recorded weight.
1. American Bison
Max weight: ~2,000–2,100 lbs
The largest land mammal in North America, and the U.S. national mammal. Bison bulls are stocky, humped giants covered in shaggy brown fur, once numbering in the tens of millions across the Great Plains before being hunted to near-extinction. Today they survive mainly in protected herds like the one in Yellowstone. The wood bison subspecies, found in northern Canada and Alaska, is the single heaviest individual bison type.
2. Moose
Max weight: ~1,500–1,800 lbs
The largest member of the deer family, moose are unmistakable with their long legs, bulbous snouts, and palmate antlers. The Alaska-Yukon subspecies is the biggest in the world. Despite their bulk, moose are strong swimmers and surprisingly fast runners.
3. Polar Bear
Max weight: ~1,500–1,700 lbs (record over 2,200 lbs)
The largest land carnivore on Earth. Polar bears are built for the Arctic ice, with black skin, water-repellent fur, and a thick layer of blubber. They spend much of their lives hunting seals on sea ice, which makes them especially vulnerable to a warming climate.
4. Kodiak Bear
Max weight: up to ~1,500 lbs
A subspecies of brown bear found only on Alaska’s Kodiak Archipelago, the Kodiak bear is the largest bear on the continent after the polar bear. Isolated on their islands with abundant salmon runs, they’ve grown to enormous size compared to mainland brown bears.
5. Grizzly Bear
Max weight: up to ~1,200 lbs (coastal populations)
The mainland cousin of the Kodiak, grizzlies are generally smaller but still formidable. Coastal grizzlies in Alaska and British Columbia, with access to rich salmon runs, tend to grow considerably larger than their interior relatives.
6. Elk (Wapiti)
Max weight: up to ~1,200 lbs
North America’s elk are the largest wapiti subspecies in the world, and the Roosevelt elk of the Pacific Northwest rainforests are the biggest of all. Bulls grow impressive branching antlers each year and are known for their eerie, far-carrying bugle calls during the fall rut.
7. Wild Horse
Max weight: up to ~1,000 lbs
Feral mustangs, descended from horses brought by Spanish colonists, roam parts of the American West in free-ranging herds. While domestic horses can grow larger, wild populations tend to top out around half a ton.
8. Muskox
Max weight: up to ~900 lbs
An Arctic specialist with a shaggy double coat built to withstand brutal cold, the muskox is more closely related to goats and sheep than to oxen. When threatened, muskoxen famously form a defensive circle with the young at the center.
9. American Black Bear
Max weight: up to ~880 lbs
The most widespread and numerous bear species in North America. While much smaller on average than grizzlies or polar bears, black bears in food-rich regions like the Appalachians can still reach surprising sizes — one boar killed in North Carolina weighed 880 lbs.
10. Caribou (Reindeer)
Max weight: up to ~700 lbs
Caribou close out the list, known for having the longest land migration of any mammal in North America — some herds travel over 1,000 miles a year between calving grounds and winter range. They’re also the only deer species in which both males and females grow antlers.
