lol luckies Definatly alot of ratty colours

okeeee...questions...lol...ummm...These are going to be easy cuz I'm in a hurry!

1. What is the most common pattern on a rat?
2. Name three actual breeds (not types) of rats that can be found.
3. Are rats the only rodent that can suck their testicles into their abdomen?

Sorry they kinda suck lol