Faecal analysis of adult Cepaea nemoralis and Cepaea hortensis from a mixed population on chalk grassland shows that the two snail species select the same plant material as food. Herbs are selected in preference to grasses and Urtica dioica is particularly favoured. C. hortensis has the more pronounced preference for senescent material. These results are discussed in relation to competition between the two species.
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Carter et al. (1979) studied this question.
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