Group-display of Smews.--On 5th February 1956, at Swithland Reservoir, Leicestershire, I watched a form of social display in a group of Smews (Mergus albellus) consisting of three males and two females, for a period of about half an hour, just before dusk. The birds were swimming along the edge of the ice which covered about half the reservoir and were behaving in the most excited way, swimming ab...

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