Warbling wrens don't just tweet, they sing duets

WASHINGTON (AP) -- They may not be Sonny and Cher, but certain South American birds sing duets, taking turns as the tune goes along. "Calling it a love song is probably too strong a word," says researcher Eric S. Fortune of Johns Hopkins University in Baltimore. But, he adds, the little wrens shift their heads around and move closer together as they sing....

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