Caspian Terns at Stratton Island

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Woke up this morning to an abnormally harsh and grating Roseate Tern above my tent before realizing that it was something more caspiany. It was gone by the time I got to my binoculars but the folks who were already up confirmed that a pair of Caspians had just been chased over the island by the Commons toward Scarborough/Prout's Neck.