RECORD SHOT at Gliwice, Poland in April 2014The Common Tern (Sterna hirundo) is a seabird of the tern family Sternidae. This bird has a circumpolar distribution, its four subspeciesbreeding in temperate and subarctic regions of Europe, Asia and North America. It is strongly migratory, wintering in coastal tropical andsubtropical regions. Breeding adults have light grey upperparts, white to very light grey underparts, a black cap, orange-red legs, and a narrow pointed bill. Depending on the subspecies, the bill may be mostly red with a black tip or all black. There are a number of similar species, including the partly sympatric Arctic Tern, which can be separated on plumage details, leg and bill colour, or vocalisations.