wren duet

I’ve heard of owls before where one partner will start a song and the other finishes it (if the sounds that owls make can be called “songs”), but it turns out there’s a species of wren in Ecuador that takes duets to a whole new level. The wrens sing a complex song that sounds like it comes from a single bird, but, in fact, the male and female alternate syllables, placing notes in the gaps left by the partner. Their precision is amazing. For more, including an audio sample, see here.