In the incident, reported Friday (July 24), the whales destroyed the rudder of a 46-foot-long (14 meters) Swedish-flagged yacht off Galicia in northwestern Spain, forcing the two people aboard to send a mayday call. A Spanish coastguard vessel towed them to safety, Spain-based news outlet Sur in English reported.
That makes the Idem at least the eighth boat lost to these encounters since they began, according to groups that track the incidents. More than 700 interactions between orcas and vessels have been logged since 2020, ranging from a brief nudge to a multihour rudder-ramming session, according to the Atlantic Orca Working Group, the Spanish-Portuguese research collective that has coordinated data collection on the phenomenon from the start.
The family-like cluster is thought to be led by a female known as White Gladis. That name comes from an early theory researchers themselves once floated: that White Gladis suffered some kind of traumatic run-in with a boat and that the encounter flipped a behavioral switch, with her being the first in the group to start ramming rudders.
So why do orcas go after the boats? Nobody knows for certain, but the leading explanation is simple: Orcas are some of the most social animals on the planet, and social animals pick up habits from one another the way trends spread through a friend group. Researchers describe the behavior as socially learned — young orcas appear to watch adults ram a rudder and then try it themselves, and the habit has spread through the group over time.
RELATED STORIESA 2022 study in the journal Marine Mammal Science found that the killer whales usually targeted sailing boats and often lost interest after striking the rudder and causing the boat to stop.
Sailors are asked to report every encounter. Each one adds to the data scientists are using to try to solve a years-long mystery.
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