Levin's work "reignited the excitement about duets," says Mennill, who was inspired to take up the study of duetting in another tropical wren.
SHE'S/HE'S MINE The current generation of duetting studies often compares his-and-her agendas.
Even if duetting doesn't guard paternity, either partner might have an agenda "to defend their partnership," as Gill puts it.
That female is duetting to discourage same-sex interlopers, the researchers suggest in the January/February Behavioral Ecology.
MY LAND Territory, as well as mates, might be worth duetting for.
Other studies in different species have pointed out that duetting birds often sing loudly from easy-to-see perches, just as solo territorial songsters do.