Types of Bison in Missouri

There are two species of bison in North America: the American Bison (Bison bison) and the extinct Bison latifrons. American Bison is the only living species and occurs in two subspecies: the Plains Bison (smaller, found historically across grasslands) and the Wood Bison (larger, found in northern forests and wetlands). Missouri historically held Plains Bison before nineteenth-century hunting eliminated them. Today, reintroduction efforts have focused on American Bison, primarily the Plains subspecies, which better suits Missouri's prairie restoration and grassland habitats.

Missouri's current bison population is entirely introduced and managed. Wild American Bison were hunted to extinction in Missouri by the late 1800s. Modern populations have been brought back through deliberate reintroduction by conservation groups, state wildlife agencies, and private preserves. These herds serve both ecological restoration (prairie management) and educational purposes. None are truly wild; all are managed to ensure herd health, genetic diversity, and visitor safety.

American Bison are massive, weighing 1,000 to 2,000 pounds. They stand 5 to 6 feet tall at the shoulder and span up to 12 feet in body length. Males (bulls) are noticeably larger and heavier than females (cows). Both have a humped shoulder, a short stocky build, and dark brown fur (ranging from near-black to lighter brown depending on season and individual). Their heads are broad and heavy with curved horns and a distinctive full beard under the chin and throat. The tail is short and tufted. Calves are lighter brown and much smaller, typically recognizable by their smaller frame and lighter coloring.

Bulls (males) are visibly larger than cows, often 20 to 30 percent heavier. Bulls have thicker, more massive heads, longer beards, and more pronounced shoulder humps. Their horns curve more sharply inward. Cows are more slender in the face and body, with a less dramatic hump and finer bone structure. In spring, bulls typically look heavier and darker due to a thicker coat, while cows shed hair earlier and appear lighter. During mating season, bulls are more aggressive and territorial, making their behavior another recognition cue.

Yes. Bison and cattle look distinctly different. Bison have a heavy, muscular humped shoulder, a broad head with horns that curve inward and upward, a long beard, and short horns relative to their head size. Cattle (particularly beef breeds like Angus or Hereford) have no shoulder hump, a narrower head, horns that point straight out or slightly upward, no beard, and a more streamlined body. Bison tails are short and tufted; cattle tails are longer and hairless. If you see a large horned animal in Missouri and are unsure, check for the shoulder hump and beard first; bison have both, cattle have neither.

Plains Bison are the smaller of the two subspecies, built for open grasslands, with shorter hair, a more refined frame, and horns that curve more gently. Wood Bison are larger, built for forest and wetland terrain, with longer shaggy hair, a heavier frame, and horns that tend to curve more sharply. Missouri's reintroduction programs have used Plains Bison because the state's remaining prairie habitats and the flat to gently rolling terrain suit their morphology better than the larger Wood Bison, which are rare in zoos and even rarer in the wild.

Bison produce low-frequency grunts and bellows that carry over long distances on grassland, especially during mating season and when calves are present. A startled or agitated bison may snort or blow air loudly through its nostrils, producing a sharp exhalation that is quite distinct from any cattle sound. Calves bleat like other ungulate young. If you are near a preserve and hear deep rumbling sounds or a loud exhalation from a distance, you may have detected bison before you see them. These sounds are a reliable way to confirm bison presence in managed areas.

Bison have split hooves and leave tracks similar to cattle but larger and wider. An adult bison's track is 4 to 5 inches wide, rounded, and shows two distinct toe imprints. The track is deeper and heavier than a cattle track of similar age because of the bison's greater weight. In soft ground (mud, sand, or snow), you'll see a pronounced impression and sometimes a heel drag. Manure (dung) is also distinctive: bison dung is rounded, often flatter than cattle manure, and tends to break apart into separate pellet groups. In Missouri's managed preserves, tracks and droppings are reliable signs of active bison.

Yes, though less dramatic than in some wild herds. Most Missouri bison are dark brown to nearly black, especially in fall and winter when their coat is full. In spring and early summer, after shedding, they may appear lighter brown or tan. Individual animals occasionally show lighter patches or a lighter overall tone, a trait that bison keepers can use to identify specific individuals. Younger animals are consistently lighter; calves born in spring are distinctly tan or reddish-brown before darkening with age. These variations, while natural, are minor compared to the obvious size and sex differences.

Current estimates for Missouri bison are modest, typically fewer than 100 animals across all managed herds, refuges, and private preserves combined. Exact numbers are difficult to pin down because populations are spread across multiple independent locations (state parks, nonprofit conservation areas, and private operations). The iNaturalist observation record for Missouri shows 39 verified sightings with 24 confirmed American Bison records, indicating that visitors and researchers regularly encounter them in preserved areas. These small managed populations serve educational and conservation goals rather than representing a self-sustaining wild herd.

American Bison are classified as 'Least Concern' by the IUCN because of recovery efforts that have increased the continental population to over 400,000 animals (including privately held herds). In Missouri specifically, the state recognizes bison as a species of historic significance and supports reintroduction through partnerships with conservation groups. Missouri does not list bison as endangered or threatened; instead, the state manages small restoration herds as part of prairie recovery projects. Viewing regulations vary by site, so always check with the specific refuge or preserve before visiting.