Collins Big Cat Collins Big Cat is a guided reading series for ages 4-11 edited by Cliff Moon. Top children"s authors and illustrators have created fiction and non-fiction books that your children will love to read, banded to help you choose the right book for every child. Practical teaching notes are included at the back of each book. Is the world"s climate changing? We all know the theory but here is the evidence, in stunning photographs and information. A stimulating approach to a topical subject.