What is the only known mammal to generate sound by stridulation?

The lowland streaked tenrec ("Hemicentetes semispinosus") is unique in that it is the only known mammal to communicate by stridulation, which is so rare that we need to explain the word stridulation. It is the act of communicating by rubbing body parts together, in the manner of crickets and lobsters. The lowland streaked tenrec has seven to sixteen specialized quills on its back, arranged in three rows, that produce sound when rubbed together.