Koala's Unique Vocal Organ Gives an Elephant-sized Mating Call [VIDEO]

Male koalas possess a specialized sound producing organ never before seen in any other land-dwelling mammal, according to new research on the marsupials during the mating season. Usually lethargic and unremarkable, koalas are anything but during an attempt to attract a mate, producing a guttural, reverberating noise that is about 20 times deeper than it should be for a animal of its size.