ML609394077

观察细节

First one seen at 5:54 am in the dark, as part of a Forster and Common tern flock. Other 2 similar birds more distant. Description of the first bird: Smaller the accompanying terns, black body, dark gray wings (above and below), gray rump above and white below. White on face apart from the auricular area. So bird in transition from breeding to non breeding plumage. Pictures of the first bird in the dark.