American bison were reduced from 60 million to fewer than 1,000 by the late 1800s; current restoration programs are rebuilding populations with growing attention to animal welfare and ecological function.
Commercial bison herds face welfare concerns similar to cattle operations including crowded feedlots, long-distance transport, and stress-inducing handling. Free-roaming bison in national parks face winter starvation and culling operations when populations exceed political tolerance. The greatest welfare gains come from large-scale prairie restoration projects where bison can fulfill their ecological role in natural social groups, experiencing the full complexity of behaviors their evolution shaped them for.