November 26, 2014
Common Redpolls Fighting for Position
In this clip we see one individual displace another on the feeder tray. Individuals will lunge at others with a closed bill, or make nipping attacks during physical antagonistic behavior. Communicative interactions include the following displays ordered in sequence from submission to high-intensity threat and represent apparent progression of increasing intensity in attack tendency: Submissive- Individual fluffs plumage and maintains posture similar to that adopted by sick, cold, or resting birds. Defensive Threat- Individual fluffs entire plumage, withdraws head, and opens bill while orienting toward the other bird. Head Forward Threat- Individual crouches slightly, sleeks plumage, and orients head and body toward the other bird. Head Forward Threat with Chin-Lifting- Individual’s posture as in Head Forward Threat and lifts head “in a quick perfunctory manner,” possibly to expose the black chin. Head Forward With Gaping- Posture similar to Head Forward Threat and plumage more sleeked; opens bill. Wing-Raised Horizontal Threat- Posture as in Head Forward Threat and plumage extremely sleeked and closed wings lifted away from body, sometimes raised over back.