It's interesting how some of those hybrids have a cockatiel-style cheek spot. Galahs don't have a cheek patch, they just have bright pink faces, although internet pictures show that on some individuals, the color is slightly more intense in the cheek spot area.

Sulphur-crested cockatoos generally have a pure white face, although some individuals seem to have a very faint yellow cheek spot. Citron-crested cockatoos have a very definite cheek spot, although it's a lot paler than what cockatiels have. Goffins and corellas have a little bit of color on the face but it's near the eye not on the cheek.

It looks like there's a tendency toward a cheek spot in some branches of the cockatoo family. I'd guess that the galahs started out with a cheek spot that developed into more widespread coloring, but when something happens to reduce the coloring in the face (like hybridization) the original cheek spot area holds onto its color better than the rest of the face.

I am aware it is biologically possible, but seeing those pictures from you Jessi, is it possible that the first galatiel Carolyn posted was a result of cockatoo x cockatoo and the first picture posted from her was Photoshopped?

What about the video, though? I've never even seen a master of editing skills, able to do something like photoshop, in a video (especially to something that's alive and moving). Not only that, but judging by the video, it looks like the bird itself is smaller than a galah, and larger than a cockatiel.

On top of that, I've noticed that the tail is longer like a cockatiel's. Unless if there's another species of cockatoo that has a long tail, I don't think I can think of any other kind of cockatoo species it could be crossed with.

by the way Carolyn, there is actually a point where galahs have cheek spots. They have them when young, and they go away as they get older.

In that case, the pictures of birds that I saw with a darker area on the cheek must have been young ones. I'm learning a lot from this thread!

Indeed, but I think most of them may keep their spots. The sulpherxgalahs did, though they're a bit more faded. They're in a wildlive reserve, where the sulphur and galah bonded though no one expected fertile eggs to be laid.