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Data Sources

Every number on this site traces back to a source.

eBird
Cornell Lab of Ornithology

Taxonomy, observation frequency, and checklist data from millions of birder submissions worldwide.

IUCN Red List
International Union for Conservation of Nature

Conservation status categories: LC, NT, VU, EN, CR — updated with each official assessment cycle.

Xeno-canto
Community bird sound library

CC-licensed field recordings embedded directly on every species profile.

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