Mon Duul
this immense creature was bio-engineered by the Yuuzhan Vong as a kind of organic speaker. Weighing more than four metric tons each, mon duuls were implanted with speciallized villips which had been created to receive transmissions from a master villip. Them using immense tympanic membranes stretched over their bellies, the mon duuls would broadcast the communications from the villip. This allowed a single Yuuzhan Vong to address a huge gathering of his comrades.