Hi Ross, Boy, that is the archetypal little brown bird with no distinguishing features. I think it would have to have a white eyebrow to be a brown gerygone. I'm stumped.
I based my ID on the closest body form I could find and it seemed most similar to a brown gerygone and it was in the correct range for the species. Even in the original higher definition photo there wasn't a marked white eyebrow only a slighter paleness above the eye.
Yep, it looks the same as your more recent brown gerygone photo from Quarantine Bay that does show the eyebrow, in general shape and colour and the stumpy little dark bill. Nothing else fits.
I think Ryu has it right. The colours in the wing and under the chin, the longer tail, and, as Jackie pointed out, the lack of white eyebrow, would point to a female or immature whistler. The diagnostic yellow around the vent has been obscured by a branch (maybe ssp youngi rather than pectoralis going on the white undertail below the vent). The lighter bill colour would also point to an immature bird. A little more on the ssp involved; "The Australian Bird Guide" (Menkhorst et al) has youngi range much expanded into the south east while pectoralis has been contracted to (around) north of Sydney.
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