Source: Ulyssis Aldrovandi De quadrupedib' digitatis viviparis libri tres : et De quadrupedib' digitatis oviparis libri duo by Ulyssis Aldrovandi (1645). This image is brought to you courtesy of the Wangensteen Historical Library of Biology and Medicine at the University of Minnesota (z.umn.edu/whl). Share your finished images using the hashtags #ColorOurCollections and #Wangensteen.