Western Chat-Tanagers (Calyptophilus tertius) are a rare and globally vulnerable songbird endemic to the island of Hispaniola. We conducted a radio-telemetry study of non-breeding Western Chat-Tanagers at two adjacent cloud forest sites in Sierra de Bahoruco in southwestern Dominican Republic during March and April of 2010. Male home ranges averaged 2.18 ± 0.25 ha in size (n = 4) and were significantly larger than those of females (0.88 ± 0.04 ha; n = 2). However, core use areas did not differ significantly between the sexes. We assumed that males and females with overlapping home ranges were mated pairs. At night, two putative pairs roosted an average distance apart of 15.8 ± 3.5 m (n = 7 observations).
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