Sexual dimorphism in the summer bill-length of the Great Tit
It has been suggested that small differences in bill length are adaptive in the Great Tit. The present study was conducted over four breeding seasons, during which bill length differed significantly between the sexes, females on average having longer bills than their partners. Since females are sign...
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| Формат: | Journal article |
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Nederlandse Ornithologische Unie
1987
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