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Snail experts are very excited after a particularly unusual snail was found on top of a compost heap in London. Dr Angus Davison from Nottingham University explains why it differs from the majority of garden snails and why it needs a mate. (Photo: The snail with an anticlockwise shell is on the right, next to a common garden snail, Credit: ÃÛÑ¿´«Ã½)