DW: And I'd rather listen to them sing Christmas music than her...
Researchers say that bats have a wider vocal range than Mariah Carey, and they use the same technique used by death metal singers for some sounds. Scientists from the University of Southern Denmark filmed a bat’s larynx while it was producing sound.
Professor Coen Elemans says that “Some human singers can reach a range of four to five” octaves with their voice, like Mariah Carey, Axl Rose, and Prince, but bats have a vocal range of seven. He says bats make a low growling noise like a death metal singer when they fly in or out of a crowded roost.
Source: Daily Mail