A group of Killer whales have been hassling boats around Spain over the last few years.  They've been nibbling the rudders and even sinking yachts, but why? Has anyone considered that it might be revenge?  How dangerous are Orcas anyway?  Featuring: Martin Evans, UK Sailor. Professor Peter Keegan, History and Archaeology at Macquarie University.  Dr Rebeca Wellard, Curtin University. Dr Luke Rendell, University of St Andrews, Scotland.  Anna Selbmann, University of Iceland. Production: Ann Jones, Presenter / Producer. Petria Ladgrove, Producer. Additional mastering:  Hamish Camilleri. This episode of What the Duck?! was originally broadcast on the 30th of September 2023 and was produced on the land of the Wadawarrung and Kaurna people.