“Mice love to run, they typically log several miles a night in their exercise wheel. These nocturnal drills are not simply a way of dealing with the stress of laboratory life, as scientists from Leiden University in the Netherlands demonstrated in a charming experiment. They left a small cage like structure containing a training wheel in a quiet corner of an urban park, under the surveillance of a motion-activated night-vision camera. The resulting footage showed that the wheel was in near constant use by wild mice. Despite the fact that their daily activities-foraging for food, searching for mates, avoiding predators- provided a more than adequate workout, the mice voluntarily chose to run, spending up to eighteen minutes at a time on the wheel, AND returning for several repeat sessions.” from The New Yorker Magazine, 11/6/2017
I feel a connection to mice now more than ever!