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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
Rhynchocyclus	Rhynchocyclus sp.	genus
Rhynchocyclus (Craspedoprion)	Craspedoprion sp. (Rhynchocyclus)	genus (synonym)
Rhynchocyclus (Cyclorhynchus)	Cyclorhynchus sp. (Rhynchocyclus)	genus (synonym)
Rhynchocyclus [brevirostris or pacificus]	Eye-ringed or Pacific Flatbill	species group (or species)
Rhynchocyclus brevirostris	Eye-ringed Flatbill	full species (or nominal subsp)
Rhynchocyclus brevirostris brevirostris	Eye-ringed Flatbill (brevirostris)	nominal subspecies
Rhynchocyclus brevirostris pallidus	Eye-ringed Flatbill (pallidus)	subspecies
Rhynchocyclus brevirostris hellmayri	Eye-ringed Flatbill (hellmayri)	subspecies
Rhynchocyclus pacificus	Pacific Flatbill	full species (or subspecies)
Rhynchocyclus [olivaceus or aequinoctialis]	Eastern or Western Olivaceous	species group (or species)
Rhynchocyclus [olivaceus or aequinoctialis, excl. cryptus]	Eastern or Western Olivaceous [excl. cryptus]	species (alt)
Rhynchocyclus olivaceus	Eastern Olivaceous Flatbill	full species (or nominal subsp)
Rhynchocyclus olivaceus olivaceus	Eastern Olivaceous Flatbill (olivaceus)	nominal subspecies
Rhynchocyclus olivaceus [guianensis or sordidus]	Eastern Olivaceous Flatbill [guianensis or sordidus]	subspecies group (or species)
Rhynchocyclus olivaceus guianensis	Eastern Olivaceous Flatbill (guianensis)	subspecies
Rhynchocyclus olivaceus sordidus	Eastern Olivaceous Flatbill (sordidus)	subspecies
Rhynchocyclus aequinoctialis	Western Olivaceous Flatbill	full species (or subspecies)
Rhynchocyclus aequinoctialis [aequinoctialis]	Western Olivaceous Flatbill [aequinoctialis]	subspecies group (or species)
Rhynchocyclus aequinoctialis aequinoctialis	Western Olivaceous Flatbill (aequinoctialis)	subspecies
Rhynchocyclus aequinoctialis bardus	Western Olivaceous Flatbill (bardus)	subspecies
Rhynchocyclus aequinoctialis mirus	Western Olivaceous Flatbill (mirus)	subspecies
Rhynchocyclus aequinoctialis tamborensis	Western Olivaceous Flatbill (tamborensis)	subspecies
Rhynchocyclus aequinoctialis jelambianus	Western Olivaceous Flatbill (jelambianus)	subspecies
Rhynchocyclus aequinoctialis flavus	Western Olivaceous Flatbill (flavus)	subspecies
Rhynchocyclus aequinoctialis cryptus	Western Olivaceous Flatbill (cryptus)	subspecies (candidate for split)