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Long-married human couples may finish each others' sentences, but the plain-tailed wrens of the Andes take things a step further. Male and female wrens sing intimate duets in which they alternate syllables so quickly it sounds like a single bird is singing. New research shows that the brains of both the male and female wrens actually process the entire duet, not just each bird's own contribution. Dr. Fortune plays some examples of plain-tailed wrens' songs.