Fun fact: scientists wanted to study why animals like mice would run on a wheel, initially thinking it was to exercise or because of being confined and needing to run. They put wheels in the wild and recorded the distance traveled on the wheels and found that a lot of mice or other small animals would run on the wheel even when they had plenty of room to run, meaning they were doing it out of enjoyment.
Fun fact: scientists wanted to study why animals like mice would run on a wheel, initially thinking it was to exercise or because of being confined and needing to run. They put wheels in the wild and recorded the distance traveled on the wheels and found that a lot of mice or other small animals would run on the wheel even when they had plenty of room to run, meaning they were doing it out of enjoyment.