Did you know that the Virginia opossum (Didelphis virginiana) has 13 nipples – 12 arranged in a circle with one in the middle?  They are also North America’s only marsupial. Spooky!

Sketch and fact contributed by Victoria Farrar

Source: Whitson, M. 2017. “Didelphis virginiana: Life History.” Accessed 10 October 2018, available from Encyclopedia of Life, http://eol.org/pages/328501