Larus ridibundus (Laridae) - Agonistic Displays

• Main Author: Tinbergen, Nikolaas
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: IWF (Göttingen) 1961
• Subjects: Life Sciences; Abwehrverhalten / Aves; Drohen / Aves; Kampfverhalten / Charadriiformes; Aggressionsverhalten / Aves; Lautäußerung / Aves; Nobelpreisträger; Larus ridibundus; Lachmöwe; Möwe / Lachmöwe; defensive behaviour / Aves; threatening / Aves; fighting behaviour / Charadriiformes; agonistic behaviour / Charadriiformes; aggression behaviour / Aves; vocal utterance / Aves; Nobel laureate; black-headed gull; Encyclopaedia Cinematographica; Boden; Black-headed Gull
• Online Access: https://dx.doi.org/10.3203/iwf/e-336; https://av.tib.eu/media/26238

Lachmöwe. Aggressives Verhalten und einige typische Körperhaltungen: leicht vorgebeugter Körper mit weit geöffnetem Schnabel, Lautäußerung ("Oblique posture"/"Long call"), Umherlaufen in aufrechter Haltung ("Upright posture"), den Kopf nach vorn-oben Strecken ("Forward posture") abwechselnd mit Pickbewegungen auf den Boden ("Choking"). : Four agonistic or threat postures are shown: the oblique posture, during which the long call is uttered; the upright posture; the forward posture and choking. In all these postures the carpal joints are lifted; this, in all gulls, is the initial phase of one of the fighting movements: wing-beating. Usually the bird faces the intruder, but when aggressive tendencies are strongly inhibited by a tendency to flee, the birds may turn away from the opponent; this is particularily striking in choking. In the upright posture, the neck and head are in the initial position from which a bill-peck starts. In the choking posture, the bird points its bill down, and often makes downward pecking movements with the bill; sometimes the wings are fully spread.