Black Oystercatcher, Avila Beach, CA скачать в хорошем качестве

Black Oystercatcher, Avila Beach, CA

Black Oystercatcher, Cal Poly Pier, Avila Beach, CA June 17, 2025 Two adults and three two-weeks-old chicks on the nest rock, with an adult bringing in food. The parents were also engaging in agonistic behavior towards two other adults, an encounter, which involved vocalization. "Birds of the World" Agonistic Behavior Piping is most common communicative display given by breeding pairs. It is used as greeting between mates or as territorial display toward intruders. Piping display has more than one function, most often associated with adults advertising or defending a territory. Boundary disputes may involve individuals facing off by walking parallel to each other along boundary. Pair members often pipe when reunited; Piping between mates is less intense than in territorial conflict. Piping often spreads contagiously within a pair or among pairs with nearby territories; more than 3 adults may pipe simultaneously. Also pipe in flight when escorting intruders out of territory. Many aggressive displays are used to defend territory or repel intruders from feeding areas. Aggressors stare (often with contour feathers erected), Pipe, rush toward intruder with bill forward, or rarely, may jab or grasp another bird with bill or strike with wings. Extended aerial pursuits of intruders by territorial birds are common, often accompanied by contact calls and piping. Pursuits end when intruder is driven out of territory.