The Level 1 pack contains 6 books, one of each of the following titles: Tin Can Tracks , Animal Tracks , In the Sun , Sun Hat, Sunscreen, Sun! , Big! , As Big As Me! . Oxford Reading Tree Explore with Biff, Chip and Kipper is a series of paired fiction and non-fiction books linked by curriculum-related topics that children will be learning about in the classroom. Each pair consists of an engaging story featuring well-loved characters and a compelling non-fiction book.