Gull-billed Tern (Gelochelidon nilotica affinis)
Gull-billed Tern (Gelochelidon nilotica affinis), Stockton Sandspit, NSW, Australia
It breeds in warmer parts of the world in southern Europe, temperate and eastern Asia, both coasts of North America, eastern South America. This bird has a number of geographical races, differing mainly in size and minor plumage details.
All forms show a post-breeding dispersal, but the northern breeders are most migratory, wintering south to Africa, the Caribbean and northern South America, southern Asia and New Zealand.