Two lovable hippos teach the meaning of friendship in five separate vignettes: "Split Pea Soup," "The Flying Machine," "The Tub," "The Mirror," "The Tooth." "The secret of Mr. Marshall's success lies not just in the freshness of his sense of the ridiculous, but in the carefulness of his control and editorial judgment." -- New York Times Book Review ALA Notable Book Horn Book Fanfare Selection New York Times Best Illustrated Children's Books of the Year