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Hippos navigate by it, sloths keep in touch through it, rabbits eat it ...and most grown-ups prefer not to mention it at all! But however you look at it, poo is probably the most useful stuff on Earth. It comes in all shapes and sizes, and every animal has its own special sort. Find out what it's for, where it goes, what we can learn from it and lots more in this book, one of six in the Animal Science series - the best biology series ever!