page_title: Chestnut-rumped thornbill
section_title: Breeding
hierarchical_section_title: Chestnut-rumped thornbill / Behaviour / Breeding
caption_attribution_description: English: Pair of Chestnut-rumped Thornbills
context_page_description: The chestnut-rumped thornbill is a small passerine bird in the family Acanthizidae, endemic to Australia.
  Specially named for its pale-chestnut rump from mediaeval Latin uropygium, the rump.
  Its other names include chestnut-tailed or chestnut-backed thornbill, tit or tit-warbler, chestnut-rumped tit or tit-warbler.
  A plain, pale thornbill, with pale eyes, it is widespread throughout inland Australia, west of the Great Dividing Range to the West Australian coast but is absent in the far north and humid southwestern WA. It is a cooperative breeder like some of the other thornbills
context_section_description: Most records of chestnut-rumped thornbills breeding involve pairs, however they appear occasionally to breed co-operatively.
  Breeding season is June - December, and two broods, possibly three can be raised per season.  The ovoid eggs are laid at two-day intervals.  They are very fine, slightly glossy, flesh-white and minutely freckled all over with reddish brown and purplish brown, particularly at the large-end.  
  Nest sites are usually in hollows, often vertical, in live and dead trees, with the entrance at the end of a spout, crevice or knothole, in the side of a branch or trunk.  They also nest in stumps, logs or branches lying on the ground and in fence posts.
  The chicks are altricial and nidicolous, with both adults feeding the nestlings and fledglings.  The fledging period is around 18–20 days.
  Both adults are involved with building nests,  which are small, neat and domed usually ovoid, with a rounded entrance at side or near top.  If inside a hollow, the entrance is often flush with the opening of the hollow.  Materials used are dried grass, bark strips, plant stems, moss, lichen and spider web, with a lining of feathers, wool or fur.
  Chestnut-rumped thornbills are known to be parasitised by Horsfield's bronze cuckoos (Chalcites basalis).
caption: Pair of chestnut-rumped thornbills (Sturt Desert, NSW).
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