Twelve bison facts, fact-checked
The bison is North America's largest land mammal and the subject of one of the most severe deliberate wildlife destructions in recorded history. Full profile in our bison guide.
1. They are not buffalo
True buffalo are African and Asian. Bison are a separate genus, distinguished by the shoulder hump and heavy head.
2. Tens of millions became fewer than 1,000
Commercial hunting and a deliberate campaign to undermine Plains nations that depended on them brought the species close to extinction within decades.
3. Recovery reached hundreds of thousands
Most are in managed or commercial herds; genuinely wild free-ranging populations remain small.
4. Cattle genes are widespread
Historic cross-breeding left many herds with cattle DNA, so genetically pure bison are a conservation priority in themselves.
5. They run at 55 km/h
And pivot quickly — far more agile than their bulk suggests, which is why visitors are injured every year.
6. Wallowing creates habitat
Rolling in dust forms depressions that hold water and support distinct plant and invertebrate communities.
7. Grazing increases prairie diversity
Their patchy grazing pattern supports a greater range of plants and birds than uniform grazing does.
8. They face into blizzards
Rather than drifting away, they walk into the storm to pass through it faster.
9. Calves are born orange
Darkening to brown within months.
10. The European bison also nearly vanished
The wisent went extinct in the wild in the 1920s and was restored entirely from captive animals — now a flagship rewilding species.
11. Yellowstone's herd is genetically important
One of very few continuously wild populations with no recorded cattle introgression.
12. Recovery is about land, not numbers
Hundreds of thousands exist, but few landscapes are large and connected enough to hold genuinely wild, freely moving herds.
Read the full bison wildlife guide for IUCN status, population context and sources — or donate to WARN to help fund the partner teams protecting wildlife on the ground.
