My kids really love his books! Currently they're obsessed with the Pigeon series, and also the Elephant and Piggie series too.

The best part of his books is how the inside back cover usually has one thing that is different from all the others. We spend a minute or two looking for it every time we read one of his books, and the kids love that! Never would've thought that an inside back cover would be the most popular of a book!

What's your kids' favorite Mo Willems series?