Aberrant Slavonian Grebe. A thick-billed and unfamiliarly plumaged Slavonian Grebe Podiceps auritus appeared on the open marine bathing-pool at Penzance, Cornwall, on 28th December 1981. It was distinctly odd-looking: rather bulky, with a relatively thick bill, and a generally rather drab, smudgy grey appearance, quite unlike the immaculate black-and-white Slavonians normally encountered in winter


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