Black Oystercatchers appear to be monogamous in their mating system, and pairs remain together year-round. During the spring, as the breeding season approaches, male and female perform paired flight and walking displays accompanied by much calling. Pairs hold territories and also perform side-by-side walking displays against other oystercatchers at the territorial boundary. Territorial birds may also drive others out by flying at them or chasing them in flight, calling vigorously. ~ All About Birds

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