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If you see lots of these (and there are a lot about) then notice how varied their shells are in colour and number of bands. To learn more about this and to record the variation visit http://evolutionmegalab.org
University of Edinburgh and Biodiversity Observatory (OU)
I will have a look Jonathan and note the variation too
Lat/Lng: 54.70785, -1.683818
OS grid ref: NZ204348