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3 December 2021 Vocal Signalling by Eurasian Spoonbills Platalea leucorodia in Flocks before Migratory Departure
Florent Lagarde, Theunis Piersma
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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.

Florent Lagarde and Theunis Piersma "Vocal Signalling by Eurasian Spoonbills Platalea leucorodia in Flocks before Migratory Departure," Ardea 109(2), 243-250, (3 December 2021). https://doi.org/10.5253/arde.v109i3.a8
Received: 19 March 2021; Accepted: 9 July 2021; Published: 3 December 2021
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KEYWORDS
departure decision
Eurasian Spoonbill
Platalea leucorodia
pre-flight calls
vocal signalling
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