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Calidris ferruginea
When flying the winter Curlew Sandpiper can be separated from the very similar Dunlin by the overall white rump, like a House Martin. The Dunlin has a black line separating the two sides. Otherwise the Curlew Sandpiper has a slightly longer and thinner bill but with some Dunlin having longer bills this can be difficult to determine. So I'm certain about the first picture and almost certain the second, but the third..... There were a lot of Dunlin about also.
Coastal tidal marshes
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