The undulated antshrike (Frederickena unduliger) is a relatively large species of antbird from the western Amazon in south-eastern Peru, western Brazil, and possibly far south-eastern Colombia. It formerly included the fulvous antshrike, which is found further west, as a subspecies.
- Isler, Isler, Whitney, Zimmer & Whittaker (2009). Species limits in antbirds (Aves: Passeriformes: Thamnophilidae): an evaluation of Frederickena unduligera (Undulated Antshrike) based on vocalizations. Zootaxa 2305: 61-68
- Zimmer, K. J. (2010). Split Frederickena unduligera into two species. SACC. Accessed 10 May 2011
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