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首页> 外文期刊>Journal of ornithology >Egg pecking and discrimination by female and male Brown-headed Cowbirds
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Egg pecking and discrimination by female and male Brown-headed Cowbirds

机译：雌性和雄性棕头牛鸟啄食和辨别鸡蛋

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摘要

Brood parasitic Brown-headed Cowbirds (Molothrus ater) remove host eggs in conjunction with parasitism, and also peck and destroy host eggs and nestlings in nests they have apparently not parasitized. Egg and nestling destruction by Brown-headed Cowbirds has been hypothesized to force hosts to re-nest, providing cowbirds with a future opportunity to parasitize a nest. We examined the egg-pecking behavior of captive male and female Brown-headed Cowbirds by presenting them with nests containing plastereggs resembling a parasitized host nest to determine how often this behavior occurs. There was no significant difference in the number of female (67 %) and male (42 %) cowbirds that pecked both egg types, but females pecked more eggs than males, and both were more likely to peck host eggs than cowbird eggs. Our results demonstrate that both females and males peck eggs, and suggest that parasites may have an even greater effect on hosts than previously realized.
机译：寄生的棕头牛鸟（Molothrus ater）与寄生虫一起去除寄主卵，并且啄食并破坏它们显然没有被寄生的巢中的寄主卵和雏鸟。据推测，棕头牛Cow会破坏卵和雏鸟，迫使寄主重新筑巢，从而为牛bird提供了寄生巢的未来机会。我们检查了圈养的雄性和雌性棕头牛鸟的啄蛋行为，方法是为它们提供巢，巢中含有类似于寄生虫寄主的灰褐色卵，以确定这种行为发生的频率。啄食两种卵的雌性（67％）和雄性（42％）牛鸟的数量没有显着差异，但是雌性比雄性啄食更多的卵，并且两者都比牛卵更容易啄食宿主卵。我们的研究结果表明，雌性和雄性都啄卵，并且表明寄生虫对寄主的影响可能比以前意识到的还要大。

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