The illustrations aren't done by Eric Carle. Without his collages it just doesn't seem like a Bill Martin Jr. book. I realize that's a silly way to think but the two work so well together.
The book is meant to be read aloud but the forced rhymes tripped me up in a bunch of places. If you plan to read this book to a group of children, I recommend practicing a few times before doing it live.
eBook The Happy Hippopotami