According to a newly published study, wild mice frequently and voluntarily run on an exercise wheel if provided access to them in nature, even in the absence of a food reward. Further, the length of running bouts by wild mice matched those of captive mice. These findings dispel the idea that wheel running is a product of captivity, indicative either of neurosis or a mindless repetitive behaviour that may be associated with poor welfare or close confinement.
Wild mice actually enjoy running on exercise wheels | @GrrlScientist | Science | theguardian.com