Ella Bella Boon lives on Mix-up Moon and has a cow with sixteen legs! Read all about Ella's unusual life in this enjoyable rhyming story. Oxford Reading Tree Story Sparks is an emotionally-engaging fiction series that will fire children's imaginations and develop their comprehension skills. The variety of authors and illustrators broadens children's reading experience, with something to appeal to every child. This story is one of six titles at Oxford Level 3, which are phonically decodable with some extra high-interest words to expand children's vocabularies and enrich the stories. All the books in the series are carefully levelled, making it easy to match every reader to the right book.