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Clutch Size, Hatching Success, and Eggshell-Thinning in Western Gulls
Abstract
Average clutch size for large Larus gulls is close to three eggs, and the production of a clutch of four is uncommon (Keith 1966; Paludan 1951; Vermeer 1963). We report here on a colony of Western Gulls (Larms occidentalis) in which many clutches containing four and five eggs were found. It is of particular interest that in these large clutches not only was hatching success low but also eggshell thickness was reduced.
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