A Review of New Understanding of the Role of Individual Structure within the Head of Dolphins in Formation of Biosonar Signal and Beam

In recent years a number of experiments and measurements associated mainly with the Atlantic bottlenose dolphin (Tursiops truncatus) and one with the harbor porpoise (Phocoena phocoena) have shed some interesting light on biosonar signal production and propagation in the head of the animals and the formation of the biosonar beam. In this short review, the results of these experiments will be taken together to increase our understanding of the subject and shed new light on the processes involved [1-4].