the precision and detail you can see when you convert the sound to a picture (a sonagram). Song sounds like bunch of whistles and trills but there’s so much more to it. There are a couple of examples on my profile here http://ias.im/u.140920
Birds have more complicated voice boxes than humans and most mammals: they have two, one for the tube coming from each lung. So they might make one sound on one side and then a different one from the other. A bird’s voice box is called it’s syrinx.
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