Avibase - The World Bird Database

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There are more than 20,000 regional checklists in Avibase, offered in 9 different taxonomies, including synonyms more than 175 languages. Each checklist can be viewed with photos shared by the birding community, and also printed as PDF checklists for field use.
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Scientific name	Common name	Status
Gygis	Gygis sp.	genus
Gygis [alba or microrhyncha]	Common White-Tern or Little White Tern	species group (or species)
Gygis alba	Common White-Tern	full species (or nominal subsp)
Gygis alba alba	Common White-Tern (alba)	nominal subspecies
Gygis alba [candida or leucopes]	Common White-Tern [Pacific]	subspecies group (or species)
Gygis alba leucopes	Common White-Tern (leucopes)	subspecies
Gygis alba candida	Common White-Tern (candida)	subspecies (candidate for split)
Gygis alba candida (candida)	Common White-Tern (candida, sensu stricto)	nominal suspecies (sensu stricto)
Gygis alba candida (monte)	Common White-Tern (candida, syn. monte)	junior synonym (or subspecies)
Gygis alba candida (pacifica)	Common White-Tern (candida, syn. pacifica)	junior synonym (or subspecies)
Gygis alba candida (rothschildi)	Common White-Tern (candida, syn. rothschildi)	junior synonym (or subspecies)
Gygis alba candida (royana)	Common White-Tern (candida, syn. royana)	junior synonym (or subspecies)
Gygis alba candida (kittlitzi)	Common White-Tern (candida, syn. kittlitzi)	junior synonym (or subspecies)
Gygis microrhyncha	Little White Tern	full species (or subspecies)
Gygis [alba x microrhyncha]	Common x Little White-Tern (hybrid)	hybrid