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Polymorphism in the grove snail
Color and pattern morphs of the grove snail, Cepaea nemoralis.The polymorphism, when two or more different genotypes exist within a given species, in grove snails seems to have several causes, including predation by thrushes.
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"Polymorphism in Cepaea nemoralis."
http://commons.wikimedia.org/wiki/File:Polymorphism_in_Cepaea_nemoralis.jpg
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