Book excerpt: Buff the Bison begins his journey in a vast green valley at Madison Junction, in Yellowstone National Park. He and his best friend, Loe, have not yet gotten to fully explore Yellowstone. Readers will follow Buff and Loe as they set off with their herd for the first time to visit some of the park's most majestic landmarks. Their probing questions - reflective of those posed by many human visitors to the park - are answered by Buff's wise mother, who is instrumental in teaching the calves about the wonders and dangers of Yellowstone life.