A Pocket Guide to Sharks of the World: Second Edition: 23 (Wild Nature Press)

Initially I bought the larger, hardback version of this book for my 7 year old, but although it was was a wealth of information, it was just way too heavy going. And literally too heavy. This pocket version is far more suited to flip through for a younger demographic - and although the text is greatly reduced, it's still crammed full of sharky goodness.