Earth Sky + Water - Petersons Backyard Birds of the Rocky Mountain States - Double-matted Posters with Honey FrameThe illustrations are by Roger Tory Peterson, along with James Audubon, who are Americas most famous bird naturalists and illustrators The illustrations are by Roger Tory Peterson, along with James Audubon, who are Americas most famous bird naturalists and illustrators The region is bordered by the Cascade and Sierra Nevada ranges on the west and the front range of the Rockies on the east. It includes portions of the following states: Washington,