Spix's Woodcreeper Xiphorhynchus spixii

Medium-sized woodcreeper with a slightly curved bill. Has buff spots on its head which become elongated semi-circles with dark edges on the mantle and underparts. Found in the understory of humid forest, where it regularly accompanies mixed-species flocks and occasionally attends army-ant swarms. The song is a fast trill that ends with a whine “-wheu.” Best distinguished from the similar Striped Woodcreeper by Spix’s darker bill, darker and less contrasting head, and different song and habitat.