Duckbill Sound Machine (2:27) The soundscape of pre-historic environments can be suggested through research based on the study of acoustics and, in terms of animal communication, bioacoustics. An example is the Parasaurolophus. "Endowed with an advanced auditory systems, Parasaurolophus used its ability to communicate with complex low-frequency calls as a primary means of defense." Today, elephants, whales and other mammals also use low-frequency communication. Source: Discovery.