The wolf's family portrait reveals a diversity of form among breeds of domestic dogs. Images for the figure are from Wikipedia. The Cavalier King Charles Spaniel was posted by Ellen Levy Finch, the Bassett, Dalmatian, Mastiff, and Scottish Terrier by Lilly M, and the Vizsla by Briantresp. The gray wolf photograph was taken by Gary Kramer, U.S. Fish and Wildlife Service.
Honeycutt BMC Biology 2010 8:20 doi:10.1186/1741-7007-8-20