This article reports research on the duet singing of this wren species from
Ecuador. Given its name, could this be the only wren species without a
barred tail? Anyway there are links in the text to listen to the duet and
the single song.. also a link to the original journal article for those who
like neurology. I don't think there are any duetting bird species in N
America, but there are in Africa. I would guess their finding apply to all
such species worldwide, but who knows?
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