WILLIAM ERVIN / SCIENCE PHOTO LIBRARY WILLIAM ERVIN / SCIENCE PHOTO LIBRARY
Bison mother & calf. View of a bison (Bison bison) cow with her one month old calf in grassland. The bison is the largest terrestrial mammal in North America, and is known locally as the buffalo. Bison live in herds, females and young form small bands and the mature males form their own groups. After it is born, a bison calf will stay with its mother until the following spring. The bison's diet is mainly comprised of grass. In winter, some herds dig for grass in the snow, while others move south to warmer climates. In the summer, herds may merge. The males are larger than the females, and may weigh over 1000 kilograms. Photographed in the Wichita Mountains, northwestern Oklahoma, USA.
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