Are you sure, Natureguy? 2 and 4 look to me more like a Brown Thornbill than a Striated. Note the rufous colour of the rump and the lack of streaking on the forehead and ear coverts. I agree that 1 and 3 are Buff-rumped Thornbills.
Brown Thornbills are overall much greyer, whereas Striateds are usually yellowish. Also compare Brown Thorbill sightings at https://canberra.naturemapr.org/Community/Species/15160 with Striated Thornbill sightings at https://canberra.naturemapr.org/Community/Species/15155. Striateds also have extensive reddish-brown on their head compared with the smaller rufous forehead of the Browns.
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