Certain bat vocalizations appear to use a similar technique to death metal growling in humans, a new study finds.
"We were interested in: how can bats make all these different sounds? They make low-frequency calls and make echolocation calls, and they span together, like, seven octaves. And that's really crazy," says Coen Elemans, the lead researcher on this study."Most mammals do three to four octaves – like the best singers in terms of vocal ranges do like five or six... And it turns out every bat can do seven.
Elemans says humans also have these folds, which are called false vocal folds because they have no function in normal speech. This area hasn't been studied a lot, but there's some evidence that these folds are recruited in extreme singing. NPR couldn't ask the bats what it's like to make sounds at this low frequency - so we asked some human practitioners instead.
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