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THE EXECUTIVE ORGANS
General remarksPosturingVoiceInventory of the calls
THE SENSE ORGANS
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adult aggressive alarm call animals attack begging begin behaviour behaviour-pattern bill bill-tip birds Black-headed Gull breeding season brooding choking club colony colour Common Gull copulation cryptic defence developed displacement activities distance drive dummies dunes eggs experiments fact feathers feeding female fighting urge function Goethe ground Gull's gullery head head-tossing Iceland Gull incubating bird incubation individuals influence innate instance intensity intention movements interesting Lapwings Laughing Gull Lesser Black-backed Gull Lorenz male male's mate mew call neck nervous system nest nest-building nest-site Niko Tinbergen normal observed occasionally Oystercatchers paddling pair parent pattern peck Plate plumage Portielje possible predators preening prey problem react reaction recognise red patch released reproductive responses ritualised Sandwich Tern seems seen sexual shape sign stimuli sitting situation species stickleback stretched strong terns territory Terschelling tests Three-spined Stickleback Tinbergen upright threat posture usually uttered walks Wassenaar watching wings young