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Taken two days ago in Oshawa, about 50 Kms east of Toronto.  The other dunlins seemed to have the greyer non-breeding plumage.  The lightly speckled underbelly makes me think this could be a juvenile, but not 100% sure.

Juvenile 1.jpg

Juvenile 2.jpg

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Calidris alpina hudsonia, the subspecies of Dunlin that breeds across arctic Canada molts before migrating, thus seeing Dunlins in full juvenile plumage in the Lower 48 is somewhat rare. This is also why Dunlin is such a late-fall migrant.

Your bird, while wearing some juvenile plumage, is not a juvenile, as it has initiated its preformative molt and is now best termed an immature (see here).

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