TIL: Opossums have 13 nipples, arranged in a circle of 12 with one in the middle.

https://en.wikipedia.org/wiki/Virginia_opossum

#til #todayilearned

https://www.reddit.com/r/todayilearned/comments/1gr46nn/til_opossums_have_13_nipples_arranged_in_a_circle/