Call-notes of Slavonian and Black-necked Grebes in autumn.-- On 24th September 1966, at the Queen Mary Reservoir, Middlesex, I heard an unfamiliar call which I eventually traced to an apparently immature Slavonian Grebe Podkeps auritus. It persistently uttered a triple keeawuk-keeawuk-keeawuk, each time stretching up its neck and looking round in the manner of a young bird calling for food. The pi...

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