A spotted hyena in the Maasai Mara, Kenya. Photograph by Frans Lanting, Corbis.It turns out that fermenting bacteria help power the social lives of hyenas. A kind of scent-based Facebook, if you will. Bacteria residing in the scent glands of spotted and striped hyenas appear to play a crucial role in producing the smelly chemicals the animals use to communicate, according to a new study. The findi