Alternate plumage, Trondheim, Norway, 5-09. © John  C. Avise.

Common Tern

Sterna hirundo

Charadriiformes; Laridae

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Transitional plumage, off Dana Point, Orange Co., 2-07. © John  C. Avise.

Alternate plumage, Trondheim, Norway, 5-09. © John  C. Avise.

Alternate plumage, Trondheim, Norway, 5-09. © John  C. Avise.