Of the 22 species of wrens found in Costa Rica, 6 are found here on the Osa Peninsula. The Riverside wren, a common resident on the Osa, is only found in the southern pacific lowlands of Costa Rica and western Panama up to ~1,200 m. Wrens as a whole belong to an interesting family of songbirds. The sexes are alike and the tropical species often remain with their mate throughout the year. They roam amongst the dense vegetation singing duets with each other in alternating phrases and one...