A flock of Sulphur-crested Cockatoos (Cacatua galerita, german: Gelbhaubenkakadu, french: Cacatoès à huppe jaune). They are very common birds. I saw large flocks of hundreds of birds when I was flying over the outback. (714k)
Here are the pictures of Sulphur-crested Cockatoo (Cacatua galerita) with links to the pages on which they appear, links to the full sized picture, and the description of the picture with links to the entry in iNaturalist (inaturalist.org)
All pictures are © Dr. Günther Eichhorn, unless otherwise noted.
Australia Birds
Dr. Günther Eichhorn Travel Website
Soaring website