Animals of the World Author:Martin Walters, Jinny Johnson The total number of animal species on Earth is possibly over 20 million---more species are discovered every year. Yet only 10 per cent of this number have been identified and studied in detail. In Animals of the World you will gain an insight into the diversity and ingenuity of his incredible range of living organisms. You will gain a better und... more »erstanding and appreciation of the development, appearance, behavior and delicate balance of the animal kingdom.