Secret underwater messages can be hidden in whale and dolphin chatter
By James Urquhart Dark-coloured false killer whales (Pseudorca crassidens), here swimming with a pod of paler-coloured bottlenose dolphins (Tursiops truncatus) Richard Robinson/Nature Picture Library/Alamy Secret underwater messages could be camouflaged as the clicks and whistles of whale or dolphin calls, fooling eavesdroppers by making them believe they are hearing marine animals. Marine mammal sounds can …