It's Mr. Tortoise's birthday and time for cake. But how many candles does the cake need? Mr. Tortoise doesn't remember how old he is so he and the partygoers try various ways to figure his age before they have the cake.

Dev Petty used to be a painter in movies—such as the Matrix films and others—but now she is the author of many books for children, including I Don’t Want to Be a Frog and its companion titles. She lives in the San Francisco Bay Area.

Ruth Chan spent her childhood tobogganing in Canada and her teens in China before studying art and education and working with youth and families in underserved communities. She is the author and illustrator of The Alpactory: Ready, Pack, Go! and Thank You, Neighbor! She now writes and illustrates full-time in Brooklyn, New York.