It should be noted that the division of the Calidris maritima species (Brunnich 1764) into three separate sub-species based on the geographic location and bird size has been proposed in taxonomy but currently remains unsettled.
• Calidris maritima belcheri (Engelmoer & Roselaar 1998; Eastern Hudson Bay and James Bay, Canada))
• Calidris maritima littoralis (C. L. Brehm in 1831; Iceland; largest of the sub-species)
• Calidris maritima maritima (Brunnich 1764; Spitsbergen and Norway)
Iceland being the image location; the large size of this sandpiper and the scalloped back with heavy spotting on the breast suggest this young adult belongs to the endemic Calidris maritima littoralis rather than being a migratory bird from either of the other two sub-species.
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Same image but determined this bird is a Purple Sandpiper (Calidris maritima) rather than a Mistle Thrush (Turdus viscivorus) originally thought. Meta data has been corrected.