Eat seeds, small fruit and berries, beetles, caterpillars, grasshoppers and insects.
Don't actually like cheese at all, unless extremely hungry - but they do really like peanut butter and really sweet chocolate.
Live only about 6 months in the wild, but 2 years in a laboratory.
Main predators are man, cats, snakes and foxes.
Are good swimmers, jumpers and climbers.
Have good eyesight in dim light.
Cannot see in colour.
Have sharp hearing and can hear in the ultrasonic range.
Have a good sense of smellHeart beats 10.8 beats per second.
Prefer to move around adjacent to walls and edges.
Produce litters of 4-16 young per year.
New borns are blind and have no fur.
Mice can cough.
There are thought to be over 200 mice in the Houses of Parliament each year, but authorities won't get a cat because no-one can be trusted to look after it responsibly.