Wild Bison Welfare: Prairie Restoration and Herd Management

American bison (Bison bison) were nearly exterminated in the 19th century and are now recovering through conservation herds, but most bison live in managed situations that create welfare considerations distinct from truly wild populations.

Key Facts

Bison were reduced from an estimated 30-60 million animals to fewer than 1,000 by the 1890s through commercial hunting
There are now approximately 500,000 bison in North America, but most live in commercial or conservation herds
Only a small number of bison — perhaps 20,000-30,000 — live in conservation herds managed primarily for ecological restoration
Yellowstone National Park hosts the largest wild bison herd of approximately 4,000-5,000 animals
Annual roundups for disease testing, vaccination, and culling of Yellowstone bison cause significant acute stress
Brucellosis management drives controversial hunting and culling programs that affect bison moving off park lands
Bison are highly mobile grazing animals that evolved to range across vast prairie landscapes
Prairie restoration projects including bison reintroduction are increasing across the Great Plains

Welfare Considerations

The welfare situation of bison is complex and varied. Truly wild bison in large protected areas have generally good welfare with natural social structures, movement opportunities, and behavioral expression. Commercial bison raised for meat face welfare challenges similar to cattle: handling stress during roundups, transport, and slaughter. Conservation herd bison undergo regular management interventions (roundup, health checks, vaccination, pregnancy testing) that cause acute stress, particularly for animals that have limited human contact. The brucellosis controversy in the Greater Yellowstone Area has led to hazing, hunting, and slaughter of bison that leave park boundaries, causing both individual welfare harm and population management tension.

What You Can Do

Support American Prairie and other bison prairie restoration organizations
Advocate for science-based brucellosis management that minimizes bison killing
Visit Yellowstone and other national parks to see wild bison and support conservation funding
Support indigenous-led bison conservation efforts including the InterTribal Buffalo Council
Choose bison products from welfare-certified ranches if consuming bison meat