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
Melanopareia	Melanopareia sp.	genus
Melanopareia [torquata, bitorquata or maximiliani]	Collared, Double-collared or Olive-crowned Crescent-chest	species group (or species)
Melanopareia [torquata or bitorquata]	Collared or Double-collared Crescent-chest	species group (or species)
Melanopareia torquata	Collared Crescent-chest	full species (or nominal subsp)
Melanopareia torquata torquata	Collared Crescent-chest (torquata)	nominal subspecies
Melanopareia torquata rufescens	Collared Crescent-chest (rufescens)	subspecies
Melanopareia bitorquata	Double-collared Crescent-chest	full species (or subspecies)
Melanopareia maximiliani	Olive-crowned Crescent-chest	full species (or subspecies)
Melanopareia maximiliani maximiliani	Olive-crowned Crescent-chest (maximiliani)	nominal subspecies
Melanopareia maximiliani argentina	Olive-crowned Crescent-chest (argentina)	subspecies (candidate for split)
Melanopareia maximiliani pallida	Olive-crowned Crescent-chest (pallida)	subspecies (candidate for split)
Melanopareia maximiliani [incl. bitorquata]	Olive-crowned Crescent-chest [incl. bitorquata]	species (alt)
Melanopareia maximiliani [maximiliani or bitorquata]	Olive-crowned Crescent-chest [maximiliani or bitorquata]	subspecies group (alt)
Melanopareia [elegans or maranonica]	Elegant or Maranon Crescent-chest	species group (or species)
Melanopareia elegans	Elegant Crescent-chest	full species (or nominal subsp)
Melanopareia elegans elegans	Elegant Crescent-chest (elegans)	nominal subspecies
Melanopareia elegans paucalensis	Elegant Crescent-chest (paucalensis)	subspecies
Melanopareia maranonica	Maranon Crescent-chest	full species (or subspecies)