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Hatching a plot

作者:段朗    发布时间:2019-03-07 11:10:14    

SHINY cowbirds decide whether to lay eggs in other birds’ nests by pecking at eggs they find there to see how old they are. Cowbirds often peck open eggs in other birds’ nests before they deposit their own. But sometimes the cowbirds destroy the eggs and just fly off without laying. To find out why, Viviana Massoni and Juan Carlos Reboreda at the University of Buenos Aires watched cowbirds visiting more than 40 yellow-winged blackbird nests. They found that the cowbirds punctured the eggs to assess how much incubation time they had left, rejecting nests with well-developed eggs as any survivors of the original clutch might outcompete their offspring ( Proceedings of the Royal Society B, vol 266,

 

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