Black-necked Grebe (Eared Grebe) Podiceps nigricollis
A scarce migrant in Norfolk, even rarer in winter.
This species is numerous in much of North America where they call them Eared Grebes. The North American race californicus differs only slightly from European birds, having a slightly longer bill on average and brown-grey inner primaries (white on European birds).
American Black-necked Grebes ('Eared Grebes', race californicus), South Bay, San Diego (California, USA), 20th April 2005