Grey goshawk of Australia (white morph) - the only pure-white bird of prey that is not a result of albinism.
Yeah but why is it called grey?
The Grey goshawk simply comes in two color forms. The grey morph and the white morph. The grey morph is more common than the white morph, thus the species is named for the more common version.
Grey morph birds look like this:
image source: click