The King Island brown thornbill is a subspecies of the common brown thornbill. It is a small bird about 11.7 cm long weighing 7.7 grams. Unlike the closely related Tasmanian thornbill it has a white rump and a distinctively long bill up to 16.2 mm. The species is endemic to King Island and is seldom seen but is probably easily confused with the Tasmanian thornbill which also occurs on King Island. The King Island brown thornbill is most likely to be found in native forest, woodland and teatree where it feeds on insects. Breeding is thought to be from September to December. The nest is a small dome shaped structure in low vegetation.
Threats come from the removal and degradation of native forest by clearing, burning and draining of swamp thickets. Exotic predators are also a threat.
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