I once had a mouse who used to stand up on my palm and groom my mustache. I guess she liked it to look a certain way. When she had nine babies, she divided them into three groups of three and nursed them in turn. I know humans who couldn’t have thought of that.
Anyhow, mice make nice pets, intelligent and affectionate. The only down side is, they don’t live very long. If they did, the world would be overrun with mice and we humans would be their servants. Frightening to think of what a mouse could learn if it lived for 20 years.