Length: 12.5 cm.
The male and female have like plumage.
Voice: Sounds resembling ‘tsee’ or ‘tsit’ but uttered only rarely.
Song: Resembling the trill of the blue tit and also similar to the song of the wren.
Size of Egg: 14.0—16.7 x 11.0—13.0 mm.
The tree creeper is an inconspicuous bird with a long, slightly downcurved bill, which it uses to collect small insects, their eggs, larvae and pupae from crevices in the bark of trees. Like the nuthatch and woodpecker, it also climbs trees, but travels upwards and around the trunk in a spiral, using its tail as a prop.
It is found chiefly in coniferous forests from lowland to mountain elevations, but occurs also in mixed and sometimes even in deciduous woods. Except for southwestern Europe and northern Scandinavia, it is widespread throughout the Continent, extending eastward as far as Japan and occurring also in North and Central America. It does not leave its nesting grounds even in the most severe winters, flitting about in the woods in search of food.
In the middle of April, it builds its nest under a piece of loose bark, in crannies, piles of wood and other semi-cavities. The nest is woven of dried grass, rootlets, lichens and moss on a layer of small dry twigs, and lined with a thick layer of feathers and hairs. The 5 to 7 eggs are incubated by the hen for a period of 13 to 15 days. Whether the male aids her in this task is not yet known with sufficient certainty.
The nestlings are fed by both parents with small insects and their larvae, as well as spiders. The young leave the nest after 15 to 16 days, being fed by the adult birds for a short while longer. Often the tree creeper has a second brood, usually in June. The young birds roam the neighbourhood and the following year raise their own families there.