Pencil drawing of a Kaibab squirrel or tassel-eared squirrel perched in a pine tree, with a forest lightly sketched in the background. This is a pencil version of a scratchboard illustration for the book "Mammals of North America" (Victor H. Cahalane, 1947), Chapter 15, "The Chipmunks and Squirrels." The final illustration in "Mammals of North A...