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Increasing taxonomic resolution dietary analysis of the Hawaiian monk seal

We examined otoliths found in regurgitate samples (spews) of Hawaiian monk seals, Monachus schauinslandi, to identify fish prey, and report for the first time that these seals eat morid cods typically found at subphotic depths. Dietary information was used to build a comparative skeletal collection and create a digital image database to aid foraging ecologists in the efficient, species-level identification of fish remains. We suggest that high-resolution dietary analysis will significantly enhance understanding of monk seal foraging behavior and food requirements, and that previous assumptions that Hawaiian monk seals forage largely in shallow coral-reef habitats are in need of revision.