There are 8 books in the Elephant & Piggie Like Reading! series. The newest book is I'm On It! which came out in 2021.

1
The Cookie Fiasco

By Mo Willems , Dan Santat ,

Book cover of The Cookie Fiasco
Four friends. Three cookies. One problem.

Hippo, Croc, and the Squirrels are determined to have equal cookies for all! But how? There are only three cookies . . . and four of them! They need to act fast before nervous Hippo breaks all the cookies into crumbs!

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2
We Are Growing!

By Mo Willems , Laurie Keller ,

Book cover of We Are Growing!
Walt and his friends are growing up fast! Everyone is the something-est. But . . . what about Walt? He is not the tallest, or the curliest, or the silliest. He is not the anything-est! As a BIG surprise inches closer, Walt discovers something special of his own!

3
The Good For Nothing Button!

By Mo Willems , Charise Mericle Harper ,

Book cover of The Good For Nothing Button!
Yellow Bird has a button. It does . . . nothing! It is a good for nothing button.

Red Bird and Blue Bird are excited to try the button. But when they press it, they discover that the button makes them happy. Happy is something! A flabbergasted Yellow Bird insists…

4
It's Shoe Time!

By Mo Willems , Bryan Collier ,

Book cover of It's Shoe Time!
This lyrical beginning-reader by multi award-winning artist Bryan Collier turns the closet on its heel and redefines what it means to be a pair. Beautifully rendered art paired with rich, rhyming dialog creates a powerful reading experience.

6
Harold & Hog Pretend For Real!

By Dan Santat , Mo Willems ,

Book cover of Harold & Hog Pretend For Real!
Harold and Hog pretend with the roles they were born to play . . . but which roles are they?

Hog is careful. Harold is not.

Harold cannot help smiling. Hog can.

Hog worries so that Harold does not have to.

Harold and Hog are best friends. But can Harold…

8
I'm On It!

By Andrea Tsurumi , Mo Willems ,

Book cover of I'm On It!
Goat likes to lead. Goat also likes Frog to follow.
When Goat jumps on it, Frog does, too. Soon Goat and Frog are on it, along it, above it, inside it, beside it, around it, and under it―phew! How can their friendship get through it?