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- W2039115433 abstract "In wintering European oystercatchers 3 bill types: pointed, chisel-shaped, and blunt were found as well as their intermediates. The distribution of the different bill types varied widely in both time and space. Pointed bills had a larger mean length than both chisel-shaped and blunt bills, and occurred more often in young birds than in adults, and more often in females than in males. On an average, females had longer bills than males. In oystercatchers in the Wadden Sea area bill length was found to increase with age, but in the Delta area no increase was found. In semi-natural cage experiments each bill type proved to be most suitable for a specific manner of localization and handling of prey. Bills of individual oystercatchers were shown to change shape when the bird was forced to change its feeding method. A change in method accompanied by a gradual change in bill form only caused a temporary loss of feeding efficiency. It is concluded that differences in bill length influence prey choice and feeding method and hence induce different bill forms. Age- and sex-dependent differences in bill length and form, together with the ability of the individual to adapt bill form and feeding behaviour, enable the oystercatcher to lessen interspecific competition and to respond to changing environmental conditions." @default.
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- W2039115433 date "1983-10-01" @default.
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- W2039115433 title "Differences in bill form of the oystercatcher haematopus ostralegus; a dynamic adaptation to specific foraging techniques" @default.
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- W2039115433 doi "https://doi.org/10.1016/0077-7579(83)90006-6" @default.
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