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Mexican species
| Gull-billed Tern (Gelochelidon nilotica) | |||
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| Subspecies | Hide subspecies | ||
| nilotica | Breeds inland southern Europe and northern Africa eastward through the Middle East to Inner Mongolia (northeastern China) and southward to Indus Valley (Pakistan); winters tropical Africa and Persian Gulf to India. | ||
| affinis | Breeds from southeastern Siberia southward to eastern and southeastern China (Bohai Gulf to Guangdong); winters mainly in southeastern Asia, some reaching the Indian subcontinent and northern Australia. | ||
| aranea | Breeds coastal New England southward to southeastern Mexico, Greater Antilles, and Virgin Islands; winters Central America to Peru and Brazil. | ||
| vanrossemi | Breeds California to northern Baja California and Sinaloa northwestern Mexico; winters to Ecuador. | ||
| gronvoldi | Breeds patchily coasts and rivers from Ecuador and French Guiana southward to northeastern Argentina. | ||
| Endemic status | |||
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