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American Coots (Fulica americana) pair, one preening its mate as part of courtship, California, USA<br />
From Birds of North America: "...the following are involved with courtship and establishment of a pair bond: Billing, Bowing, and Nibbling; these 3 displays all closely related and often follow each other sequentially; apparently occur between potential mates and help establish mutual recognition during pair formation. In Billing, 2 birds touch each other’s bill when meeting, followed by Bowing by submissive bird and presentation of its head and neck to its partner. Dominant bird then begins Nibbling, working its bill through feathers of submissive partner.."