One thing that has to be kept in mind about dark billed and/or dark legged 
Common Terns seen on Long Island in the spring is that our Common Terns (Sterna 
hirundo hirundo) have dark bills and dark legs in winter (both the young birds 
and adults). The possibility that these birds are just S. hirundo hirundo 
retaining aspects of their winter plumage must be considered. Indeed, given the 
breeding and wintering ranges of S. hirundo longipennis, S. hirundo hirundo 
with retained winter characters seems a more likely possibility.

Joe DiCostanzo

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