Nesting
The Brown Treecreeper breeds cooperatively and usually forms a long-term socially monogamous pair. Both sexes are able to breed in their first year, with the female usually finding a mate within two years and the male usually obtaining a breeding position sometime after three years. The breeding season lasts from July to February with the majority of eggs laid from September until late October. Incubating is undertaken by the breeding female only.
The nest is usually located in a tree hollow beneath a canopy, often nearby the boundary of another Brown Treecreeper territory to attract extra help feeding. Building of the nest is undertaken by all members of the group over a period of 1–2 weeks. Nest materials consist of twigs, grass, leaves, bark, dung, animal fur and sometimes human refuse such as aluminum foil. One bird has been recorded collecting fur from a live possum. During building of the nest the breeding female usually transports the heavier nest materials and may discard material delivered by other members of the group.
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