Researchers analysing thousands of audio recordings of sperm whale communications report that whales on different sides of the Mediterranean produce different click patterns. Sperm whales communicate using sequences of short clicks called codas, and the timing and rhythmic structure of these codas form what scientists describe as “dialects.” The findings indicate that matriarchal social groups maintain different dialects, with groups in the eastern Mediterranean showing vocal patterns that differ from those associated with whales on the western side. One study focuses on how an isolated eastern Mediterranean group may have developed its own dialect by incorporating patterns from vocalizations used by other whales, while later diverging over time. Another report describes signs that the Mediterranean population may be splitting into two groups, each with its own dialect, based on the consistency of the recordings. Across outlets, the studies emphasize that dialects are linked to stable social units and can change as vocal traditions evolve in different groups. The research is based on comparative analysis of recorded vocal behaviour rather than direct observation of physical separation.