The Great Crested Grebe Podiceps cristatus shows many striking and puzzling features in its reproductive biology, these being the subject of the present paper which is primarily concerned with adaptive aspects. My own studies on this species, which involved over 1,350 visits to various waters and some 3,000 hours in the field, were made in 1948-62 and 1966-70, mostly at gravel-pits in the Kennet V


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