We investigated the annual and monthly patterns of earthworm consumption by wild boar in the Maurienne valley (Alps, France). A positive correlation ( R 2 = 0.79) was found between weather conditions and patterns of earthworm consumption. A positive correlation was also found between earthworm consumption rates and the occurence of 'worm nights', an easy and direct measure of earthworm availability.
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Baubet et al. (2003) studied this question.