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Portugal Collisions Renew Focus on Orca ‘Dialects’ as Scientists Test Play Theory

New acoustic recordings aim to show whether the encounters reflect play rather than aggression.

Overview

  • Five people were rescued on September 13 after a yacht sank off Portugal following repeated strikes by orcas, with coastal authorities coordinating the response.
  • The Independent reports a separate collision off Portugal earlier this week that required four rescues, noting it was the third such incident in seven days.
  • Researchers led by Dr Javier Almunia are deploying floating buoys to capture killer whale calls during tuna hunts and will compare them to sounds made during boat encounters.
  • Plans include attaching video cameras and sound tags to orcas and using decoy boats to record interactions, testing the hypothesis that rudder-focused rammings are playful rather than aggressive.
  • An orca expert says interactions have fallen by about 80% since Spain advised sailors in 2022 to navigate closer to shore, as officials and sailors continue to update guidance in known hotspots.