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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 affect military sonar systems, so they are usually deemed ocean noise and filtered out. This makes these animal signals a stealthy solution for communicating secretly underwater.
To test the idea, Chunyue Li and her colleagues at Tianjin University in China designed a method …
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