Thomas Lazar / Common loon (Gavia immer) in winter plumage, Pine Lake, Waukesha County, Wisconsin, November.
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Roger Powell / Willow grouse (Lagopus lagopus) male in winter plumage, standing on a vegetated mound in a tundra habitat, Varanger fjells, Finnmark, Norway. May.
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Roger Powell / Willow grouse (Lagopus lagopus) male in winter plumage, walking across a snowy forest track, Pokka, Lapland, Finland. May.
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Roger Powell / Red knot (Calidris canutus) in winter plumage walking across mudflats, Holy Island Nature Reserve, Lindisfarne, Northumberland, UK. February.
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Roger Powell / Small flock of migratory Red knot (Calidris canutus) in winter plumage landing on mudflats, Holy Island Nature Reserve, Northumberland, England, UK. February.
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Roger Powell / Black-headed gull (Larus ridibundus) in winter plumage, portrait, Amble, Northumberland, UK. March.
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Konrad Wothe / Dunlin (Calidris alpina) in winter plumage walking over rounded stones, Iceland. March.
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David Pike / Little grebe (Tachybaptus ruficollis) in winter plumage, F River Exe, Devon, December.
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David Pike / Little grebe (Tachybaptus ruficollis) in winter plumage, River Exe, Devon, December.
