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It's only the two-note "Bat-maaaaan" bit that they sing, apparently. Which doesn't mean they're incapable of doing more, of course, but that's what was tested for.
BTW, when they say "first nonhuman animal shown to do [insert cool acoustic thing here]" they usually mean first nonhuman mammal. Birds are generally accepted as being able to do virtually any acoustic trick--mimicry, rhythm/frequency contour learning, etc.--while mammals are not. And it's usually dolphins that provide the "First nonhuman mammal shown to do it" paper, as much because of the amount of acoustic research done on them as because of inherent dolphin coolness. The first studies demonstrating acoustic mimicry were also on dolphins IIRC, but we now know that, for instance, a zoo elephant was capable of mimicking (quite closely) a passing truck. |
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