Certhiidae

Certhiidae, the treecreepers, is a family of small passerine birds comprising nine species in a single genus, Certhia, widespread in wooded regions of the Northern Hemisphere. Their plumage is dull colored, and their defining trait, reflected in the common name, is climbing over the vertical surfaces of tree trunks in search of food, a behavior that has shaped both their anatomy and their ecological role. This description is adapted from Wikipedia contributors under CC BY-SA 4.0; changes were made. https://creativecommons.org/licenses/by-sa/4.0/