Do you know of any children's books that teach kids not to bully other kids? Or books that teach the value of kindness? Thanks!

I love to read-aloud Julia Cook's series of books on children's behaviour. Some titles such as: -My Mouth Is a Volcano! -Baditude! What to Do When Life Stinks! (Responsible Me!) -Tease Monster: A Book About Teasing Vs. Bullying (Building Relationships) and etc. You can refer to the list from here: http://www.amazon.com/Julia-Cook/e/B005EYIEL4/ref=dp_byline_cont_book_1