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M. Dragonetti ( www.xeno-canto.org )
The Gull-billed Tern is a large, solid-looking tern. The bill is thicker and sturdier than that of similar species such as the Sandwich Tern. Contrary to what you might think it is an insect-eater!
http://en.wikipedia.org/wiki/Gelochelidon_nilotica
http://eol.org/pages/1049737/maps