Treecreeper
(Certhia familiaris)
The treecreeper is a small (12.5cm), very active, bird that lives in trees. It has a long, slender, downcurved bill. It breeds in the UK and is resident here. Birds leave their breeding territories in autumn but most range no further than 20 km. Its population is mainly stable. Best looked for on the trunks of trees in suitable woodland. In autumn and winter, it often joins flocks of tits and other small birds, so if you come across such a flock in a wood, it is worth listening out for a treecreeper among them. It feeds on insects and spiders, and some seeds in winter.