List of data deficient birds

Avian species (IUCN, 2025-2)
  • 11,198 extant species have been evaluated
  • 11,161 of those are fully assessed
  • 9,734 are not threatened at present
  • 1,427 to 1,464 are threatened
  • 169 to 187 are extinct or extinct in the wild:
    • 164 extinct (EX) species
    • 5 extinct in the wild (EW)
    • 18 possibly extinct [CR(PE)]

As of January 2026, the International Union for Conservation of Nature (IUCN) lists 37 data deficient avian species.

This is a complete list of data deficient avian species evaluated by the IUCN. Where possible common names for taxa are given while links point to the scientific name used by the IUCN.

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