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Vocal signalling by Eurasian Spoonbills Platalea leucorodia in flocks before migratory departure
Lagarde, F.; Piersma, T. (2021). Vocal signalling by Eurasian Spoonbills Platalea leucorodia in flocks before migratory departure. Ardea 109(2). https://dx.doi.org/10.5253/arde.v109i3.a8
In: Ardea. Nederlandse Ornithologische Unie: Arnhem & Leiden. ISSN 0373-2266; e-ISSN 2213-1175, more
Peer reviewed article  

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Keyword
    Platalea leucorodia Linnaeus, 1758 [WoRMS]
Author keywords
    vocal signalling; pre-flight calls; Eurasian Spoonbill; Platalea leucorodia; departure decision

Authors  Top 
  • Lagarde, F.
  • Piersma, T., more

Abstract

    We describe a vocal signal and associated postures shown by Eurasian Spoonbills Platalea leucorodia leucorodia just before the departure of (part of) the flock from a site, but also occurring in flight. Onomatopoetically called ‘ook’, it is a soft muffled sound that was noticed in Spoonbills at a stopover site during southward migration in southwestern France and at a post-breeding feeding site in The Netherlands. When making the ‘ook’-sounds, adults as well as juveniles contributed to what looked like dialogues, the sound of the juvenile having a higher pitch than that of the adult. On the basis of their specific occurrence in pre-departure contexts, we propose that the vocalizations function during collective decision-making, perhaps contributing to reach consensus before and during non-routine group movements from one place to another.


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