Where the Bison Roam
Act 1, Scene 4, Page 21 of 47
Many scientists think that bison don’t depend on groomed roads to migrate.
Bison migrating from Hayden Valley to the Firehole River use areas that are influenced by thermal activity. By following such a route, bison encounter less snow and more easily available food. Once such a migration path is set, small groups of bison use the network of trails often enough to maintain it. Rosie was lucky.
A group of four large bulls had already reopened the trail, and the thermal influence allowed Rosie to find nourishment in the form of sedges growing along the banks of open streams.
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