South-western Australia, extending north to Moora and east to the Stirling Ranges. A single record from east of Kalbarri, farther northern in central subcoastal zone.
Population
Estimated population is unknown (2010).
Voice
Call: and Song: Rapid, ringing, staccato twittering in erratic bursts on the same pitch, similar to that of the Buff-rumped Thornbill (Acanthiza reguloides).
Western Thornbill (Acanthiza inornata) [XC872198]
by Mark Harper from Dryandra, Shire of Cuballing, Western Australia, Australia (call)
Western Thornbill (Acanthiza inornata) [XC383181]
by Drew Davison from Tomingley Rd, Dryandra Woodland, Western Australia, Australia (call, song)
Nest
Dome, oval, composed of grasses and lined with feathers, usually placed against the trunk of a bushy tree, behind a piece of bark on a tree trunk, or in a hole in a tree.
Eggs (Guide)
Usually 4; pale flesh-white, with pale red to rich brown freckles and spots, often forming a zone at the larger end; oblong-oval; about 16 x 12 mm. Incubation: about 20 days.
Young
Altricial, nidicolous. Fledge in 17 - 18 days. Fed by both parents.
Proposed subspecies mastersi (wettest portion of southern coast of south-western Australia, east to Albany) may be worthy of recognition, as sharp gradation occurs between darker population in extreme southern and paler one to the north; further study is required.
The Field Guide to the Birds of Australia Pizzey, G., and Knight, E., 1997, Angus & Robertson, Sydney ISBN 0 207 19691 5
Field Guide to Australian Birds Morecombe, M., 2000, Steve Parish Publishing Pty Ltd. ISBN 1 876282 10 X
Field Guide to the Birds of Australia Simpson, K., and Day, N., 1999, 6th Edition, Viking ISBN 0 670 87918 5
Reader's Digest Complete Book of Australian Birds 1988, 2nd Edition, Reader's Digest ISBN 0 949819 99 9
What Bird is That? 1984, Revised Edition, Angus & Robertson, Sydney ISBN 0 207 14846 5
Handbook of Australian, New Zealand & Antarctic Birds 1990 - , Oxford University Press, Melbourne ISBN 0 19 553244 9
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BirdLife International Species Factsheet