White-browed Scrubwren
Sericornis frontalis

White-browed Scrubwrens are small birds (11-13 cm) which are not too shy, but move quickly as they inspect low foliage for food. Their taxonomy is somewhat unclear with between three and ten subspecies recognised by different authorities. The first photo is of S. f. maculatus, which can be told by spotting on the breast (just about visible in this picture), which is found in the far south-west of WA. The remaining two are likely S. f. frontalis, found in south-east Australia. The bird in the third photo was part of a large flock, possibly on seasonal migration out of the Blue Mountains.
 

1: Porongurup NP, WA, 29/09/2012.
2: Katoomba, NSW, 01/06/2011.
3: Mt Wilson, Blue Mountains, NSW, 20/06/2010.