Polar Bear, Polar Bear, What Do You Hear?; and really anything he’s written. One of Eric Carle’s classic books is Have You Seen My Cat? In this book, a little boy worries about his missing cat ...

Sales of that edition soared, and subsequent picture books in the series -- Polar Bear, Polar Bear, What Do You Hear?, Panda Bear ... which encourages kids to make up their own rhymes.” ...