One of the most common neotropical migrant warblers in Costa Rica is the Chestnut-sided Warbler (Dendroica pensylvanica). They were everywhere we went in November,1998. You generally hear only the calls of the migrant warblers there. This one was recorded on the grounds of "El Gavilan", where I like to stay when in the La Selva area.
Douglas Von Gausig (recordist; copyright holder), Naturesongs.com
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