Scientists in Europe are puzzled over a spate of attacks where Orca have been ramming boats - sinking some of them.
Experts are questioning whether the pods are deliberately going after the vessels, and is a behaviour they are learning.
So far no one has been injured in the most recent incidents but New Zealand faced it's own tragedy last year when 5 people were killed when charter boat in Kaikoura capsized after potentially colliding with a whale.
Co-founder of WhaleResuce.org Jo Floppy Halliday speaks to Charlotte Cook about what might be behind the orcas' behaviour.
