Abstract
The Masked Water-Tyrant (Fluvicola nengeta) occurred historically in northeastern Brazil. In recent decades, its range has expanded to the south and west, reaching the states of southeastern Brazil, where it previously did not occur. We present the first record for Paraguay and the second record for Argentina, which further extend the species’ distribution. Our observations support the opinion that the species is in expansion, being favoured by human habitat alteration. Additionally, we support the use of Viudita Enmascarada as a common name in Argentina and Paraguay.
References
ALVARENGA HMF (1990) Novos registros e expansõesgeográficas de aves no leste do estado de São Paulo.Ararajuba 1:115–117
FITZPATRICK J (2004) Family Tyrannidae (tyrant-flycatchers). Pp. 170–461 en: DEL HOYO J, ELLIOT A YCHRISTIE A (eds) Handbook of the birds of the world.Volume 9. Cotingas to pipits and wagtails. LynxEdicions, Barcelona
GUYRA PARAGUAY (2004) Lista comentada de las aves deParaguay / Annotated checklist of the birds of Paraguay.Guyra Paraguay, Asunción
HAYES FE (1995) Status, distribution and biogeography ofthe birds of Paraguay. American Birding Association,Colorado Springs
KRAUCZUK ER, KURDAY D Y ARZAMENDIA E (2003)Presencia de Fluvicola nengeta en la provincia deMisiones, Argentina. Lundiana 4:161

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
