Warbling wrens don't just tweet, they sing duets

Nov 03, 2011 By RANDOLPH E. SCHMID , AP Science Writer
This undated handout photo provided by the journal Science shows an adult male plain-tailed wren captured on the slopes of Antisana volcano at the Yanayacu Biological Research Station and Center for Creative Studies. They may not be Sonny and Cher, but certain birds living in the Andes Mountains sing duets, taking turns as they song goes along. (AP Photo/Eric Fortune and Melissa Coleman, Science)

(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.

Fortune thinks it's a test, with the choosing mates based on how well the males can follow cues and keep up with the song.

Birds singing duets isn't unheard of, but it's rare and these perform the fastest and most precise songs known, Fortune said in a telephone interview.

The birds live in dense bamboo groves in the in Ecuador, Fortune and colleagues report in Friday's edition of the .

The females start the song, he said, and the males join in. Sometimes the males will drop out for a bit. He isn't sure if it's a mistake on their part, or they just can't keep up. Indeed, the birds alternate chirps so quickly it can sound like a single bird singing.

"It's as if the birds each sing their own unique part," Fortune explained. If the song had lyrics that went A, B, C, D, the female might be doing A and C while the male did B and D, he said. And, he added, the duet songs vary slightly from place to place.

Reports of the duets from prompted Fortune, who studies psychology and , to begin his research, seeking to learn how the brain handles details of the shared song.

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