Most pet stores carry special feed mixes, but your rat or mouse may also enjoy some fruit and vegetables. Supplies All mice and rats need a cage or glass tank for a home. You will also need a water bottle and absorbent bedding. Living Space Mice and rats usually live in a glass tank with a coating of absorbent bedding. Personality Mice and rats are more active than other rodents.
Rats tend to be most active at night.
This site posted by the Minnesota branch of the American Association for Lab Animal Science is quite comprehensive.