Bison are migratory animals by nature. Alaska's wild bison do not remain in single herds, but scatter alone or in groups ranging up to 50 animals or more. In the Delta Junction area, they move far up the Delta River in early spring to secluded meadows where they calve. Here they sometimes cause damage to unharvested crops. Alaska's other wild bison herds also have seasonal movement patterns.
Bison move slowly while feeding and appear to be quite clumsy.
This is pure deception, for when pursued the bison is fleet of foot and has great endurance. A mature bull eventually captured at Delta Junction jumped a seven-foot log fence from a standing position. Their diet is made up mainly of various grasses and forbs like vetch, a favored summer food found on gravel bars. Sedges, silverberry, willow, and ground birch are also eaten. Good bison range is limited in Alaska, and it is unlikely that large numbers of bison can sustain themselves here as they did millennia ago.