Took this photo of a female-type shoveler at Monger Lake in Perth, WA, Australia today (Oct 23). It was noticeably paler than other female shovelers in the area and the bill was remarkably orange. The lower mandible especially was completely orange (seen from below as the bird preened). Outer rectrices are whitish but seem a bit worn and is probably an unreliable feature in this individual. Pale face seems to contrast with the body plumage, at least more than a typical Australasian Shoveler. Eye is a little paler than usual as well. The bird was not seen in flight. When I first found it, it was alone. A threesome of Aussie Shovelers (2 eclipse males and 1 female) swam past but this bird made no attempt to associate with them. Mostly just poked around the shoreline with some shelducks and didn't seem to like me getting too close.
Obviously Northern Shoveler would be a big deal down in WA, so can someone say this is within range for Australasian? Any opinions or key fieldmarks to look for that I haven't mentioned would be much appreciated.