Its a no-brainer that birds have different strategies for survival. The Treecreeper has a pretty extreme strategy - it tries not to get noticed any time, any place. It does this by living in a woodland where it mimics a bit of branch. In going for the invisible option , even it's call cannot be heard by some older humans and is pretty faint at the best time. The rest of the time it imitates a bit of tree branch which is does expertly.
In winter they can be attracted to food - either something oily on a branch or even on the ground. With repeated visits they can be more accommodating and stay longer. Such was the case yesterday with this confiding individual.