List of data deficient birds

As of December 2020, the International Union for Conservation of Nature (IUCN) lists 46 data deficient avian species. 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.

Procellariiformes
• Elliot's storm petrel

• Pincoya storm petrel

Gruiformes
• Brown-banded rail

• Colombian crake

Owls
• Maned owl

• Seram masked owl

Passerines
• Black-headed rufous warbler

• Sillem's mountain finch

• Black-tailed cisticola

• Tana River cisticola

• Dusky tetraka

• Spectacled flowerpecker

• Rossel cicadabird

• Duida grass-finch

• Louisiade pitta

• Black-lored waxbill

• Eastern wattled cuckooshrike

• Black-browed babbler

• Tessmann's flycatcher

• White-chinned myzomela

• Sombre rock chat

• Javan oriole

• Red Sea cliff swallow

• Snow Mountains robin

• Upemba masked weaver

• African river martin

• Blue-wattled bulbul

• Obbia lark

• Philippa's crombec

• White-tailed tityra

Caprimulgiformes
• Vogelkop owlet-nightjar

• Spangled owlet-nightjar

• Mayr's swiftlet

• Three-toed swiftlet

• Whitehead's swiftlet

• Fernando Po swift

• Spot-fronted swift

• White-fronted swift

• Letitia's thorntail

• Cayenne nightjar

Other bird species
• White-faced plover

• Somali pigeon

• Chestnut-shouldered goshawk

• White-chested tinkerbird

• Little paradise kingfisher

• Worcester's buttonquail