A thought-provoking book for children aged 5+ years that explores biodiversity and opens up key discussions about the environment and the topical issues highlighted in David Attenborough''s documentary Extinction: The Facts. There are estimated to be around 20 quintillion animals living on Earth, but it''s tricky to picture so many animals! So instead, let''s imagine just 100 animals at a time . . .What does it look like? How are animals divided up? How many species are still to be discovered? Where in the world can wild mammals be found? And how ''wild'' are they really? What are the most popular pets? How many species are extinct and how many are in danger?