The Level 1 pack contains 36 books, six 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.