Sulfur-crested Cockatoo. You've probably seen the beautiful ones in bird shows or on TV. Wild ones like this guy look beaten up and unkept.
Unbelievably loud they're quite easy to find in the wild though they usual stay high up in the trees.
I was watching a river for Platypus when this one came crashing into a tree next to me to take a look at me... I guess out of curiosity.

Eungella National Park - Australia
Dec 2011