Bison in Winter by Castle Geyser

Bison that have committed themselves to wintering in the Upper Geyser Basin

follow a daily pattern of movement. At night they sleep on patches of ground

that are geothermally heated; during the day they move about to feed on

whatever meager forage they can find. Castle Geyser is erupting in the

background as this small bunch travels towards a feeding area.

Every print and book are signed by Tom Murphy