Behaviour
Treecreepers are generally unobtrusive and are often indifferent to humans. They occur as singles or in pairs, sometimes in small family groups after fledging. Communal roosting has been observed in three species (and may occur in more), with as many as 20 birds sharing a roosting hole in order to conserve warmth.
Treecreepers forage on the trunks of large trees. They move up the trunk in a progression of small hops. They fly to the bottom of a tree, then climb in in a spiral fashion searching for prey. The majority of their diet is composed of small invertebrates, including insects and their larvae, spiders, and pseudoscorpions. In hard times seeds and fruits may be taken, and a few species will also visit birdfeeders. Species in both genera have been recorded joining mixed-species feeding flocks.
The treecreepers are monogamous and territorial. Nests and eggs vary between the genera. The Certhia treecreepers usually nest in a gap between the tree bark and the tree, whereas the nest of the Spotted Creeper is placed in the fork of a branch. Incubation lasts 14 to 15 days, and young fledge after 15 to 16 days.
Read more about this topic: Treecreeper
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