Rats are amazing animals. It's a shame they're near the bottom of the food chain.

I love my breeder rats. They are so smart.
I retired all of my first generation breeder girls as pets. They litter trained themselves instantly on Day 1 in their new cage after living their entire lives in a rack.
My favorite female was trained to come when called to give a high five.
Other than that, I haven't trained my other rats. I don't have much time.