Odd sighting, Gregory NP, NT.

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Michael,
Pale-headed Munia (Mannikin) is a possibility - though they have silver grey 
bills when pale headed as adults. Juveniles do have dark bills but are pale 
brown non-descript birds with dark(er) heads.
The species occurs in Timor and has been observed twice on West Island, 
Ashmore Reef. Given this, there is always the chance they could occur on the 
mainland. Here is a pic of one of the Ashmore Reef birds on George Swann's 
Kimberley Birdwatching site.
http://www.kimberleybirdwatching.com.au/images/bird%201c.jpg

Cheers,
Rohan


Rohan Clarke
www.wildlifeimages.com.au