Having dived for the first time in the sea on the Plymouth coast, I wanted to get a book so that I knew what the animals were instead of the usual "It was a big brown fish", or "large crab". I was attracted to this book due to the photographic reputation of Paul Naylor and I can say I wasn't disappointed. The book is broken down by animal group (sponges, worms, fish etc) and is packed with top quality colour photos. Each photo is accompanied by a well written description of the animal and in many cases details unique characteristics of each group, such as how sponges reproduce and how they defend themselves. For other animals Paul Naylor illustrates the animals life cycle, such as developing from eggs to planktonic larval stage to adult etc. I found this book educational and a very enjoyable read, worthy of a space on your bookshelf, if you manage to put it down that is.