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Abstract
The profitability (energy content per second of handling time) of cockles, Cerastoderma edule, to oystercatchers, Haematopus ostralegus, increases with cockle size. In accordance with the predictions of optimal foraging theory, oystercatchers selected the more profitable (i.e. larger) cockles. The percentage abandoned at the different sites increased with the mean size taken, suggesting that attacks on large cockles were less likely to be successful. Oystercatchers use some visual cues to find prey during the day, but use only tactile cues at night. They take smaller prey at night, with a flesh content 25% less than those taken during the day.
Published Version
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