Unique hedgehog-like mammals have been filmed using their quills to communicate.
A BBC film crew captured footage of the streaked tenrecs in the eastern rainforests of Madagascar.
By rubbing together specialised quills on their backs, the tenrecs made high pitch ultrasound calls to each other in the forest undergrowth.
The footage is the first of a mammal communicating in this way, a technique called
stridulation — via redwolf.newsvine.com