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Woodcreeper, any of about 50 species of tropical American birds constituting the subfamily Dendrocolaptinae, family Furnariidae, order Passeriformes. Some authorities classify the birds as a separate family (Dendrocolaptidae). Woodcreepers work their way up the trunks of trees, probing the bark and leaves in search of insects; some species also feed on the ground. Most are 20–38 cm (8–15 inches) long (some smaller) and have brownish body plumage with pale streaks or bars on head and...