Caption:
American black bear, Ursus americanus a, brown bear, Ursus arctos b, polar bear, Ursus maritimus c, and raccoon, Procyon lotor d. Chromolithograph from Gotthilf Heinrich von Schubert's Natural History of Animal Kingdoms for School and Home (Naturgeschichte des Tierreichs fur Schule und Haus), Schreiber, Munich, 1886.