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Paul Marvin ( www.xeno-canto.org )
The Royal Tern breeds mainly in North America. There is also a small population in the west of Africa. The Royal Tern is sometimes seen in Spain, but in Europe it remains a very rare bird. It is one of the largest ternspecies.
http://en.wikipedia.org/wiki/Thalasseus_maximus
http://eol.org/pages/1049718/maps