Overview
- The peer-reviewed study, published June 23, 2026, analyzed 5,291 sperm whale ‘codas’ recorded from 2003–2021 and found consistently faster click patterns in the eastern Hellenic Trench and slower patterns around the western Balearic Islands.
- Authors interpret the tempo difference as cultural divergence in progress rather than full separation because male whales still cross the sea and maintain genetic links between east and west.
- Researchers documented occasional ‘bilingual’ switching, with some eastern individuals producing the slower western codas on a few recorded days, showing vocal flexibility within the population.
- The Mediterranean subpopulation is small, long-isolated and endangered, so changes in vocal culture could alter how scientists identify social groups and target threats such as fishing entanglement and ship strikes.
- The result is based on the largest regional acoustic dataset to date, and the team says follow-up work tying calls to tracked individuals, movements and behavior is needed to inform conservation actions.