From one of my hand-lettered textbooks titled Wa-Maka-Skan: Fundamentals of Wildlife Ecology and Conservation, this page summarizes the diversity of wild dogs in North America. These members of the Family Canidae display in their body size and in the sizes of their appendages (e.g. tails and ears) the effects of natural selection operating in various environments (north to south, cold to warm).
A page from Wa-Maka-Skan, a hand-lettered wildlife ecology textbook by Fred Montague. © 1996, 2012.