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Why are they bad?
here in the Manchester area I never saw a snail until about 12 years ago, they were usually found near the coast or areas with a lot of calcium in the soil which is what they need to form there shells. We live on black soil due to coal mines etc. I have always found there shells are very flimsy. I know this might sound unbelievable but one of my neighbours found some when she went on holiday to the seaside and thought they were cute so she bought a bucketful home and placed them round her pond. We have never looked back. Prior to that we never had a problem in our close.