The number of avifaunal species reported is 528 to 530. Threatened species of birds with the IUCN designations of Least Concern (LC), Near-threatened (NT), Vulnerable (VU) or Endangered (EN) are: North African ostrich ("Struthio camelus camelus", LC); ferruginous duck ("Aythya nyroca", NT); lesser flamingo ("Phoenicopterus minor", NT); white-backed vulture ("Gyps africanus", NT); Rueppell's griffon ("Gyps rueppellii", NT); pallid harrier ("Circus macrourus", NT); red kite ("Milvus milvus", NT); Stanley bustard ("Neotis denhami", NT); Nubian bustard ("Neotis nuba", NT); corn crake ("Crex crex", NT); black crowned crane ("Balearica pavonina", NT); Eurasian curlew ("Numenius arquata", NT); black-tailed godwit ("Limosa limosa", NT); great snipe ("Gallinago media", NT); African skimmer ("Rynchops flavirostris", NT); European roller ("Coracias garrulus", NT); red-footed falcon ("Falco vespertinus", NT); sooty falcon ("Falco concolor", NT); white-headed vulture ("Trigonoceps occipitalis", VU); Beaudouin's snake-eagle ("Circaetus beaudouini", VU); lesser kestrel ("Falco naumanni", VU); and Egyptian vulture ("Neophron percnopterus", EN).