By Wild at Heart Images. “The grandeur of the bison herds migrating through Hayden Valley makes me think of what it must have been like when millions of their kind roamed North America.” –Sandy Sisti, photographer. Sandy has been a photographer for over twenty years and a lover of nature and wildlife since childhood. She hopes her images will inspire you to explore the wonders of nature in your corner of the world. 11” X 7” with matted frame.