Serpophaga munda (MPR):breeds in Argentina between October and January and flies to lower elevations, to the north and east of the Chaco and to Patagonian lowlands during austral winter, with some individuals flying to coastal regions in southeastern of Brazil and Uruguay (Fitzpatrick, 2004). It migrates every year from the Andes to the Pantanal during colder periods (D. Oliveira, pers. comm.), as shown by recaptures in the Pantanal Matogrossense National Park in June 2013 (Cemave, unpublished data). All photographic and sound records available are for RS and are distributed throughout the year (WikiAves, 2016), which suggests a resident population (even though there is no evidence of breeding activity). Because of its migratory behavior in the Pantanal, this species was considered partially migratory.