Richard Klim
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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.
http://www.mapress.com/zootaxa/2009/f/z02305p068f.pdf
Richard
http://www.mapress.com/zootaxa/2009/f/z02305p068f.pdf
Richard