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Range DescriptionPhaethornis aethopyga is recognised as a valid species following a study into aspects of the population's plumage, distribution and behaviour that found strong evidence against its treatment as a hybrid (Piacentini et al. 2009). This species is endemic to Brazil, known only from the vicinity of the Teles Pires, TapajÃ³s and Xingu rivers, south of the Amazon (Piacentini et al. 2009).