Orcas have been sinking ships off the coast of Portugal and Spain—with at least three attacks happening in the last month. Scientists believe it could just be a game or fad, although one theory is a bit more outlandish: a female orca may have been traumatised by being hit by a rudder and is now taking ‘revenge.’ Either way, it’s believed she’s the originator of the practice and has taught the rest of her pod how to do it.

We find out exactly what’s going on with Luke Rendell from the University of St Andrews in Scotland.

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Fad or revenge: why are killer whales sinking boats?