Abstract
In a high-density insular population of masked shrews (Sorex cinereus), Diptera, amphipods, Araneae, and Coleoptera dominated the diet. The prominence of littoral amphipods and kelp flies in the diet indicates a pattern of beach foraging not previously described for this shrew. Remains of these prey were found in shrews captured as far as 60 m inland. We speculate that abundant littoral invertebrate prey, present throughout much of the year, partly sustain the high number and extended breeding season of shrews on this island.
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