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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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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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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The first evidence that some small birds respond to common cuckoos Cuculus canorus as if they were sparrowhawks Accipiter nisus is provided, and tits showed similarly strong alarm to barred and unbarred hawks, and little alarms to barred doves, suggesting that naive small birds can mistake cuckoo for hawks.
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This paper presents the first experimental study of the effects of mobbing on predators. Two captive little owls Athene noctua and a tawny owl Strix aluco, having stabilized activity patterns and…
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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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