|Tasmanian Scrubwren Sericornis humilis, Freycinet NP, female above, male below.|
Like most other scrubwrens, she's a washed-out version of him.
|Zebra Finches Taeniopygia guttata, Kata Tjuta NP, Northern Territory.|
She, in the centre, lacks his chestnut cheeks and flanks.
|Australian Darters Anhinga novaehollandiae, Canberra, female above, male below.|
His plumage is richer in colour, especially the chestnut throat and dark breast.
|Cockatiels Nymphicus hollandicus, Sturt NP, far north-west New South Wales.|
This exquisite arid land cockatoo is the world's smallest.
Again, males are a more intense version of the grey, white and yellow theme.
|Cactus Finches Geospiza scandens, Santa Cruz, Galápagos, female above, male below.|
He has much more melanin in his feathers, but it's essentially the same pigment.
|White-browed Woodswallows Artamus superciliosus, Canberra, female above, male below.|
Again the difference is evident, but is in intensity of shades.
|Australian Wood Ducks Chenonetta jubata, Canberra, male right, female left.|
|Green Pygmy-geese Nettapus pulchellus, Fogg Dam, near Darwin, female left.|
These are not really geese at all, but in the mainstream line of duck.
|Chiloé Wigeons Anas sibilatrix, Puerto Natales, southern Chile, male right.|
Despite the name, this pretty duck is widespread across southern South America.
|Black-necked Storks Ephippiorhynchus asiaticus, Croydon, North Queensland.|
He has black eyes, she yellow.
|Galahs Eolophus roseicapilla, Nambung NP, Western Australia.|
In this case she has red eyes, while his are black.
|Magpie-larks Grallina cyanoleuca, Canberra, female above, male below.|
In this case the only difference is in the face colour - black for him, white for her.
(Immatures have a black forehead and white throat and sort it out later!)
|Magnificent Frigatebirds Fregata magnificens, Galápagos, male left.|
She has a white throat, where he of course has the red throat pouch.
(In this case he is flying higher than her, he is not smaller.)
|Olive-backed Sunbird pair Cinnyris jugularis, Cairns, Queensland.|
It may initially seem that they are very different, but nearly all the difference is in his iridescent throat.
|Nankeen Kestrel Falco cenchroides;female, Fraser Island, above, male, near Canberra, below.|
Here the distinction is in crown and tail, chestnut for her, grey for him.
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