Secret underwater messages can be hidden in whale and dolphin chatter
Covert messages sent underwater can be camouflaged in the sounds of whales and dolphins, making them harder for others to detect
Dark-coloured mendacious slayer whales (Pseudorca crassidens), present swimming with a pod of paler-coloured bottlenose dolphins (Tursiops truncatus) Richard Robinson/Nature Picture Library/Alamy 
Secret underwater messages could beryllium camouflaged arsenic the clicks and whistles of whale oregon dolphin calls, fooling eavesdroppers by making them judge they are proceeding marine animals.
Marine mammal sounds tin impact military sonar systems, truthful they are usually deemed water sound and filtered out. This makes these carnal signals a stealthy solution for communicating secretly underwater.
To trial the idea, Chunyue Li and her colleagues astatine Tianjin University successful China designed a method …
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