There might be two hundred million different types of living things on our planet - and some are in danger of becoming extinct. Find out about some that we have lost forever, and some that are in great danger: Animals such as the blue whale, the black rhino and the great white shark. Why is it happening, and what can we do about it? Then read Bill and Ben's story - a true story about how sometimes it is very hard to do the right thing to help endangered animals survive.

This is one of a series on books on popular non-fiction topics. As with other books in the series, a full colour non-fiction section is followed by a fiction story based upon the topic. The story appears in two formats: one with simple texts for poor or reluctant readers; the facing pages contain an illustrated "speech bubble" version for those who are just starting to read.