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The Yorkshire Conchological Society field meeting to Rudston in East Yorkshire in May 2009 turned in to an adhoc snail identification training day for a group of students from York University.
Group photograph by the megalith at Rudston Church:

Students recording in the Gypsy Race nr Rudston:

Photos © Terry Crawford

Molluscs are slugs, snails, shellfish and marine animals like octopus and squid, though the Yorkshire Conchological Society, affiliated to the YNU, concentrates on land and freshwater snails and slugs. The group records the distribution of land Mollusca, and maintains county species databases and distribution maps.