Researchers at the Massachusetts Institute of Technology, studying a clan of sperm whales in the East Caribbean, found the mammals use clicks to tell other whales who they are.
Sperm whales are known to be very sociable and communicate with each other across thousands of miles with a series of rhythmic clicks, called codas.
Researchers have analysed recordings from 60 different members of the Eastern Caribbean sperm whale clan to create what they call a "sperm whale phonetic alphabet" of different click combinations.
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