Chinese companies increasingly have been borrowing cheap money from abroad. Now they are paying for it.

But it’s also possible that “the groan” isn’t about pain or exertion at all, Dr. Davis said. “I was in bed and turning over, and I was like, ‘Uhhh,’” she recalled.

Hyenas are famous for their loud laughs, but hyena groans may be an equally important facet of their vocal repertoire. The spotted hyena has a rich range of vocal calls, including loud whoops and ...