Eastern Yellow Robin
Eopsaltria australis
At 15 to 16 cm (6 in) in length and 15 to 28 g (0.03 to 0.06 lb), the eastern yellow robin is one of the larger Australasian robins, and one of the most easily observed. Pairs and small family parties establish a territory—sometimes year-round, sometimes for a season—and seem little disturbed by human presence. They appear not to migrate any great distance, but will make local movements with the seasons, particularly to higher and lower ground.
ID text from Wikipedia, CC BY-SA 4.0

Western Yellow Robin
Eopsaltria griseogularis
The western yellow robin ranges between 13.5 and 15.5 cm (5+1⁄4 and 6 in) long, with a wingspan of 24–27.5 cm (9+1⁄2–10+3⁄4 in) and weight of 20 g (0.7 oz). The male and female are similar in size and coloration, with no seasonal variation in plumage. The head, neck, and upper parts are grey, with a white throat fading into a grey breast. The lores are black, the eyebrows are paler grey, and there is some faint pale streaking over the ear coverts. The underparts are yellow and clearly delineated from the breast.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Eastern Yellow Robin and Western Yellow Robin.