Treecreeper varying its usual insect diet with peanuts!

The Common Treecreeper is like a feathered mouse which discretely climbs in spirals up the trunk of one tree before flying down to start on the next one. Its speckled brown plumage provides excellent camouflage but the silvery-white underparts may give it away. Other features to look for are its long pale eyestripes, slender down-curved bill and black-edged golden wing-bar sometimes glimpsed as it flies.

To find Treecreepers you should listen for their calls. The usual 'ssst, ssst, ssst' at regular intervals evokes for me an image of a bird going up a tree trunk in stages. The thin sibilant song is surprisingly far-carrying, rising to crescendo as if getting increasingly impatient.
They eat bark-living insects, spiders and their larvae.

Being so small, Treecreepers are particularly susceptible to heat loss on cold winter's nights but it has been shown that sometimes they may save heat by roosting communally to 'keep each other warm'.