This is the story of Roo, a little dinosaur who one day meets a woolly mammoth in a hot-air balloon. The balloon has a hole and gradually deflates, floating down to the ground and leaving the little mammoth stranded. Roo saves the day by giving the mammoth a piece of his precious comfort blanket (his moomie, as he calls it) which they use to patch the hole. An adorable story about kindness and sharing, with lovable characters and beautiful illustrations young children will love this picture book.