TIL that wild mice (and many other wild animals) will run on an exercise wheel, even when not in a cage, just because they like it!

https://www.sciencenews.org/blog/wild-things/mice-really-do-run-wheels



Submitted December 22, 2014 at 07:32PM by Ripsaw99 http://www.reddit.com/r/todayilearned/comments/2q2ho7/til_that_wild_mice_and_many_other_wild_animals/