Coal tits, Parus ater, lose weight in response to chases by predators.

@article{Carrascal1999CoalTP,
  title={Coal tits, Parus ater, lose weight in response to chases by predators.},
  author={Carrascal and Polo},
  journal={Animal behaviour},
  year={1999},
  volume={58 2},
  pages={281-285}
}
Theoretical models predict that birds should decrease their body mass in response to increased predation risk because lighter birds take off faster and are more manoeuvrable. We studied the effect of predation risk by chasing coal tits in large outdoor aviaries thus simulating an attempt to capture them. With this increase in predation risk, both perceived and actual, coal tits lost significantly more weight than in a control situation when they were not pursued. This pattern was attributable… CONTINUE READING
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