SANDWICH TERN Thalasseus sandvicensis


Another widespread species which always shows a black bill except on the Eastern littoral of South America, where birds may have yellowish bills.Whether they are a separate species, Cayenne Tern, is open to debate, but it is strange that everywhere else in the world only black-billed birds occur.The american race of sandwich tern has recently been split as Cabot's Tern, but birds occuring in the USA are black-billed.


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