The Clements Checklist of Birds of the World is a book by Jim Clements which presents a list of the bird species of the world.

The Cornell Lab of Ornithology has provided annual updates since then, usually in August, and the most recent version is available online in several formats.

[1] These updates reflect the ongoing changes to bird taxonomy based on published research.

eBird also uses the Clements checklist as the base list for its eBird taxonomy, which in addition to species includes hybrids and other non-species entities reported by birders.

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