Larus ridibundus (Laridae) - Agonistic Displays

• Main Author: Nikolaas Tinbergen
• Other Authors: Kompetenzzentrum für nicht-textuelle Materialien
• Format: Course Material
• Language: unknown
• Published: IWF (Göttingen) 1961
• Subjects: Nobel laureate; Larus ridibundus; Möwe / Lachmöwe; zoology; Charadriiformes - Wat- und Möwenvögel; Aggressionsverhalten / Aves; agonistic behaviour / Charadriiformes; black-headed gull; vocal utterance / Aves; defensive behaviour / Aves; Zoologie; threatening / Aves; vertebrata - vertebrates; Vertebrata - Wirbeltiere; Drohen / Aves; Lachmöwe; biology; ethology; morphology; Encyclopaedia Cinematographica; Lautäußerung / Aves; Biologie; aves - birds; Ethologie; Morphologie; Aves - Vögel; Kampfverhalten / Charadriiformes; fighting behaviour / Charadriiformes; Nobelpreisträger; aggression behaviour / Aves; Abwehrverhalten / Aves; charadriiformes - waders; gulls and auks; Studienbereich Biologie; Mathematik; Naturwissenschaften; Black-headed Gull
• Online Access: https://av.tib.eu/media/26238

(en)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.