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Birds find ways to avoid raising cuckoos' young
Date:4/8/2013

ces inaccessible to cuckoos. These birds therefore are less "skillful" in ejecting the mimic cuckoo eggs from their nests. As barn swallows in China still build nests outside and therefore are more susceptible to brood parasitism, they are better able to assess when an egg is not theirs and remove the foreign egg from their nest quickly. This shows that they have been able to develop an alternative strategy to reduce the likelihood of cuckoo parasitism.

The authors conclude that "suitable cuckoo hosts breeding close to human habitation enjoy a selective advantage from breeding indoors in terms of reduced risk of parasitism. Cuckoos are more likely to parasitize barn swallow nests outdoors than indoors. These findings suggest that birds benefit from association with humans in terms of reduce risk of parasitism."


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Contact: Joan Robinson
joan.robinson@springer.com
49-622-148-78130
Springer
Source:Eurekalert

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