•   Extinct in the wild (EW): 5 species
•   Critically endangered (CR): 223 species
•   Endangered (EN): 460 species
•   Vulnerable (VU): 798 species
•   Near threatened (NT): 1,001 species
•   Least concern (LC): 8,460 species
•   Data deficient (DD): 46 species

Avian species (IUCN, 2020-3)

• 10,999 extant species have been evaluated
• 10,947 of those are fully assessed^[a]
• 9,461 are not threatened at present^[b]
• 1,481 to 1,533 are threatened^[c]
• 164 to 183 are extinct or extinct in the wild:
  • 159 extinct (EX) species^[d]
  • 5 extinct in the wild (EW)
  • 19 possibly extinct [CR(PE)]

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1. ^ excludes data deficient evaluations.
2. ^ NT and LC.
3. ^ Threatened comprises CR, EN and VU. Upper estimate additionally includes DD.
4. ^ Chart omits extinct (EX) species

As of December 2020, the International Union for Conservation of Nature (IUCN) lists 46 data deficient avian species.^[1] 0.47% of all evaluated avian species are listed as data deficient. No subpopulations of birds have been evaluated by the IUCN.

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.

Includes petrels and albatrosses

("Crane-like")

• Lists of IUCN Red List data deficient species
• List of least concern birds
• List of near threatened birds
• List of vulnerable birds
• List of endangered birds
• List of critically endangered birds
• List of recently extinct birds