Are Blackcaps (Sylvia atricapilla) defending their nests also calling for help from their neighbours?

@article{Grim2007AreB,
  title={Are Blackcaps (Sylvia atricapilla) defending their nests also calling for help from their neighbours?},
  author={Tom{\'a}{\vs} Grim},
  journal={Journal of Ornithology},
  year={2007},
  volume={149},
  pages={169-180}
}
  • T. Grim
  • Published 1 April 2008
  • Environmental Science
  • Journal of Ornithology
One hypothesized function of conspicuous mobbing of intruders by bird nest owners is to attract neighbouring birds (“calling for help” hypothesis) or third-party predators (“attract the mightier” hypothesis). These may help the nest owners by distracting and/or attacking the mobbed intruder. To date, these hypotheses have been studied solely during the mobbing of predators. Here, for the first time, I have studied mobbing attraction in the context of brood parasitism. I experimentally tested… 

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TLDR
The results of the present study indicate that repeated conspicuous mobbing calls may carry a significant cost for birds during the breeding season.

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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
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