|Image: California Academy of Sciences|
Stridulation is when an animal communicates by rubbing parts of its body together to make a noise. It's common amongst crickets and the like, but the only mammal known to do it is the Lowland Streaked Tenrec (Hemicentetes semispinosus).
They look like little shrews or hedgehogs but they have specialised quills for making high pitched sounds to each other.
Look at that spiky, yellow headdress! Only in Madagascar...
More on the stridulating Lowland Streaked Tenrec.