I am not a biologist and I did not mean to offend anyone.
I was from my own experience. I had a rat and guinea pig and none of them ran in the wheel, they were ignoring it. The seller in zoo store said that "those animals are not so stupid". So, I thought the wheel is only for small rodents like mouses or hamsters. It was unexpected to see a squirrel running in the wheel.
As for my support team (upvoters), it were eSteem voting bots. When you make a post, using eSteem, you get small support from its developer.
Best wishes for you and your pets.☺️