A few days ago for #AudioMo I posted a recording of a single bird and said I didn't know if I had the recording of the mating pair... But I do!!

I think this is particularly fascinating. The one bird sings an interval of (almost) a fifth, and the other does an approximation of the teeth kissing sound in some cultures used to express disdain, but it sounds so cute, I can't bring myself to make that association with anything other than a smile.