Bret Pasch, a graduate student at the University of Florida, says there are plenty of mouse species that sing. "The more we search, the more we find that rodents and other small mammals produce ...

What is even stranger, rather than having a deeper voice as they get bigger as ... In fact, you’re far more likely to hear a dolphin squeak like a mouse than roar like a lion.

MONTAGNE: That really is the squeak of a mouse. Some researchers tried to find ... kind of whistle it was and how it happened in their voice box at all. STEVE INSKEEP, BYLINE: But it's not like ...