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A total of 8772 dive durations were recorded during 117 diving bouts in five Cormorants Phalacrocorax carbo and five Shags Phalacrocorax aristotelis breeding at the Chausey Islands, France. Diet of the birds was assessed by analysis of 526 pellets containing 13,016 otoliths. Radio-tracking data indicated that Cormorants fed exclusively on pelagic fish during social fishing (5% of the trips) and executed...
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