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Related Experiment Videos

How selfish is a cuckoo chick?

Kilner1, Davies

  • 1Department of Zoology, University of Cambridge

Animal Behaviour
|November 30, 1999
PubMed
Summary
This summary is machine-generated.

Cuckoo chicks use rapid begging calls to exploit host parents, compensating for a less conspicuous visual signal. Their begging intensity is driven by hunger, not just need or host rejection.

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Area of Science:

  • Animal behavior
  • Evolutionary biology
  • Ornithology

Background:

  • Brood parasitism is common in cuckoos (Cuculus canorus).
  • Nestling begging displays are crucial for soliciting parental care.
  • Cuckoo nestlings exhibit unusually rapid begging calls compared to host young.

Purpose of the Study:

  • To investigate the function and evolutionary drivers of rapid begging calls in nestling cuckoos.
  • To test hypotheses related to chick need, begging signals, and host provisioning.
  • To understand how cuckoos exploit host parental care strategies.

Main Methods:

  • Observational study of nestling cuckoos (Cuculus canorus) reared by reed warbler (Acrocephalus scirpaceus) hosts.
  • Analysis of begging display intensity (vocal and visual) in relation to chick hunger and host provisioning rates.

Related Experiment Videos

  • Growth rate comparisons between single cuckoo chicks and host broods.

    • Main Results:

    • Cuckoo begging displays directly correlate with hunger levels and function solely to solicit food.
    • Cuckoo nestlings do not exaggerate begging due to greater food needs than host broods.
    • Rapid vocalizations compensate for the cuckoo's visually simpler begging display (single gape) compared to host broods.
    • Cuckoo selfishness in soliciting food was equivocal, with mixed results regarding provisioning rates relative to need.

    Conclusions:

    • Cuckoo begging calls are an adaptation to exploit host provisioning rules, compensating for visual signal deficiencies.
    • The intensity of begging is primarily driven by the chick's hunger state.
    • Further research is needed to determine if cuckoos possess species-specific begging displays.