It must have looked like a scene in a movie Western: a herd of bison crossing a river, dust in the air, noise, splashing, all set against the grandeur of Yellowstone National Park in May. The herd included bison calves, born in late March through May that year. …

This Field Note was written by Janet Cass. Would you be interested in writing one? Contact Allison De Jong, Field Notes editor, at adejong [at] montananaturalist [dot] org or 406.327.0405. Please visit the Field Notes website at the Montana Natural History Center for more information.