Avibase is an extensive database information system about all birds of the world containing over 1 million records about 10000 species and 22000 subspecies of . Suggested citation for the current version of the clements checklist the ebird clements checklist of birds of the world v2018. The clements checklist of birds of the world 6th edition was published and released by cornell university press in june 2007 the book was produced from a nearly . The ioc world bird list complements three other primary world bird lists that differ slightly in their the clements checklist of the birds of the world . Birdlife international maintains its own complete checklist of birds taxonomic checklist of the worlds bird species because there are so many different
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