1. Rats bathe/groom themselves 6 or more times a day
2. Rat's don't have gallbladders or tonsils
3. Rats resemble a 1.5 year old nonverbal toddler- To me they seem a bit smarter than that though
4. Rats are capable of making relatively complex assoaciations
5. They say that rats enjoy classical music.
More facts to come.