This species is similar to Common and Arctic Terns in appearance, but they are the most common species on the shores of Argentina and Chile where I saw these ones. We saw large breeding colonies with individuals in many different stages of development. These pictures are from Ushuaia where we took a scenic boat tour the day before we set sail for Antarctica. They are slightly larger than Common or Arctic Terns.
Adult breeding bird.
An older Juvenile bird almost into non-breeding adult plumage.
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