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I'm fairly sure this is a Rufous-Naped Wren, spotted on the Pacific coast of Costa Rica near Tarcoles. It is a large wren that breeds in lowlands and foothills from sea level up to 800 m (2,600 ft) altitude in forest or open woodland, scrub, second growth and savanna. It is found mainly on the Pacific side of the central mountain ranges. Its spherical nest has a side entrance and is lined with seed down. This species sometimes nests close to the nests of wasps and there is experimental evidence that those that do so are afforded substantial protection from predation by doing so.