Below are three more photos of the Western Ground Parrots held in the Australian Museum Collection. The photos were supplied by Dr Walter Boles of that Museum and are used with permission.
The photos of individual adult female and male show a difference in the beak shape with the male's upper beak being broader with a grooved ridge at the centre. The female has a sharper, finer ridge. Sometimes males have no groove, but a broad, rounded, ridge.
The group photo of three adult birds has the female on the left then two males. A female held in the Western Australian Museum has a yellower belly than this but she also retains some blotching around the throat and upper breast as this bird (23539) has. Though both are adults, the male in the centre is probably younger than the male on the right (23538). The (presumed) older bird has very little dark blotching and only fine streaks on the throat and upper breast, and the yellow belly is more pronounced.
Juvenile WGPs are heavily blotched and streaked.
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