"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"." - Eivind from Bookmarklet

Awesome! - Eivind

"They could also be using high pitched calls to echolocate in the dark forest, finding their way with sound rather than sight in a similar way to bats." - That is so cool! - Ken Morley

They are the only mammals communicating this way :-) - Sepi ⌘ سپی

Ken: Yes! Exactly, Sepi, isn't it cool? :) - Eivind

Very cool; stridulation is really common in insects, but for a mammal to use it is pretty novel. :) - Jenny H

Almost sci-fi. Also bc of the aspect of the little creatures. - Franc, a rememberer

simply amazing! - adam

kirpiye benziyor ama sanırım kirpi değil :) - Ali Oz

Yes ... so cutttttttttte ... :-) - Sepi ⌘ سپی

fascinating! - mina_sydney