The treecreepers are a family, Certhiidae, of small passerine birds, widespread in wooded regions of the Northern Hemisphere and sub-Saharan Africa. Treecreepers “creep” up forest tree trunks with a series of mouse-like small hops, spiraling up around the trunk in search of small arthropods, which they glean from crevices in bark and branches with their fine, slightly decurved bills. Like other tree-climbing birds, treecreepers possess stiffened tail feathers for support on tree trunks. Their brown-toned plumages with contrasting streaks and spots make these diminutive birds hard to see from afar, and their high sibilant calls are difficult to localize. 

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