“…The species exhibits some interesting parallels with Cistothorus, including living in a marsh habitat, construction of woven domed nests on grasses or emergent vegetation (Martínez and Martínez, 1991;Llanes Sosa and Mancina, 2002;Forneris and Martínez, 2003), and vocal similarities. Based on recordings and videos (Internet Bird Collection, http://www.hbw.com/ibc/species/zapata-wren-ferminia-cerverai; Xeno-canto, http://www.xeno-canto.org/species/Ferminia-cerverai; both accessed September 2017), male Ferminia have vocal repertoires (e.g., see Xeno-canto catalog XC256894), as in many wren species (e.g., Kroodsma, 1975;Kroodsma and Verner, 1978;Molles and Vehrencamp, 1999;Logue, 2006;Bradley and Mennill, 2009), and may engage in matched countersinging as seen in some Cistothorus (Kroodsma and Verner, 1978). At least some Ferminia songs include a series of repeated low-frequency syllables most closely matched among wrens, based on my extensive listening to wren vocalizations both in the field and in recordings, by songs of the marsh wren C. palustris (e.g., fig.…”