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- W4234201806 abstract "Various methods have been used to gain insight into what marine mammals eat. Their aquatic lifestyle usually limits direct observations of feeding, except in shallow waters in geographical areas where water visibility is good. The development of echolocation capabilities in odontocetes (toothed whales) and physiological adaptations for deep and prolonged dives allowed for the exploration of deep waters in search of food. Some groups of cetaceans, such as beaked whales and several phocid seals, were able to evolve the ability to dive to great depths and take advantage of food resources unavailable to other predators. From a presumed terrestrial insectivore diet, marine mammals switched largely to fish, squid, and shrimp as main prey (in addition to other crustaceans, mollusks, and zooplankton organisms). The traditional method to study marine mammal food habits has been the analysis of food remains present in vomit or scat from living animals, and the stomachs and intestines of stranded animals. This method relies on the finding and identification of structures representing a typical meal, e.g., fish bones and the jaws of cephalopods, often referred to as “beaks” due to their superficial resemblance to beaks of parrots. Fish ear stones (or otoliths), in particular, are diagnostic structures in the identification of prey because their size and shape vary considerably from species to species." @default.
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- W4234201806 date "2009-01-01" @default.
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- W4234201806 title "Diet" @default.
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- W4234201806 doi "https://doi.org/10.1016/b978-0-12-373553-9.00076-6" @default.
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