Co-evolution: A Behavioral ‘Spam Filter’ to Prevent Nest Parasitism

@article{Wheatcroft2009CoevolutionAB,
  title={Co-evolution: A Behavioral ‘Spam Filter’ to Prevent Nest Parasitism},
  author={David J Wheatcroft},
  journal={Current Biology},
  year={2009},
  volume={19},
  pages={R170-R171}
}
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References

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TLDR
Costs to host defences are demonstrated such that once the parasite goes extinct on a particular host species, defence mechanisms are selectively disadvantageous.
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TLDR
It is shown by experiment that host discrimination against badly matching eggs is a selective force in gens maintenance and that cuckoos lay a better mimetic egg where the host species is apparently more discriminating.
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TLDR
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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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I DO not know if the hibernating of swallows and other summer visitors is still a debated question or not, but the following account of a cuckoo may be of interest to some of your readers.
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TLDR
Mounts of a Cuckoo Cuculus canorus, a Sparrowhawk Accipiter nisus and a Jay Garrulus glandarius were presented at nests of Reed Warbler Acrocephalus scirpaceus at all breeding stages to demonstrate that Reed Warblers can tell Cuckoos from Sparrowhawks, as can many non-host species.
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