The Common Treecreeper, Certhia familiaris, is a small bird found through much of temperate Europe and in some parts of Asia.
It is the only treecreeper that breeds in Ireland, Great Britain and most of Scandinavia.
It averages 12.5-14cm in length (including tail). The plumage is fairly drab in appearance – a streaked brown above and white below.
Its long stiff tail feathers help it creep up tree trunks like a mouse. It has a long curved bill.
It lives in woodlands throughout its range, and nests in tree crevices or behind the bark of introduced Giant Sequoia. The average clutch consists of nine eggs.