This is a Crested Screamer. I haven't heard her actually scream but I bet it could be vicious because she is an awfully large bird. She lives with the flamingos in San Diego Zoo.
Trivia: There is an unseen force which lets birds know when you've just washed your car.
WOW have never seen or heard of this bird. Looks a little scary indeed. Good to know about the birds knowing when you wash your car...I always suspected ... hahahaha!