One great advantage of the winter months is the disappearance of all those pesky leaves. As a result, treecreepers in particular seem to appear from nowhere.
That doesn’t mean they’re necessarily obvious though; while they’re quite common, their resemblance to “a moving sliver of bark” (Mark Cocker, in Birds Britannica) makes them tricky to spot until you get your eye in.
Even worse, they’re often hiding round the back of the tree, or squeezing themselves into crevices in pursuit of insects.
Other fascinating facts:
they weigh about 9 grams (the same as a pound coin);
the females favour the higher parts of trees, while the males forage lower down. Interpret that however you will.
What brilliant camouflage!