Appendix S1. Custom version of the R package ‘‘unmarked’’ used to fit the Dail-Madsen model. The package can be installed on Windows using the R command: install.packages(‘‘’’, repo=NULL).

Appendix S2. List of golden-winged warblers, blue-winged warblers, and their hybrids encountered between 2006–2010 in the Cordillera de Tilarán, CostaRica.

Fig. S1. Location of study area (black square) with reference to elevation (m) in Costa Rica.

Table S1. Summary statistics of variables considered in abundance models for golden-winged warblers surveyed with point counts in the Cordillera de Tilarán, CostaRica, 2007–2009.

Table S2. Summary statistics of home range habitat availability variables for 17 radio-tracked golden-winged warblers surveyed at 97 point count station counts in the Cordillera de Tilarán, Costa Rica, 2007–2009.

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