An international team of biologists led by Dr Benjamin D. Charlton from the University of Sussex has discovered that koalas (Phascolarctos cinereus) possess a unique sound-producing organ that has never before been seen in any other land-dwelling mammal. A koala in the Great Otway National Park, Victoria, Australia. Image credit: David Iliff / CC-BY-SA 3.0. During the breeding season, male koalas produce low-pitched mating calls that are characterized...
