A new documentary series from James Cameron on whales has captured never-before-filmed whale behaviour across the world including in the waters of New Zealand.

New Zealand Marine biologist Dr Ingrid Visser was a contributing scientist to the documentary Secret Lives of Whales, which is narrated by Sigourney Weaver.

The team caught never-before filmed orca hunting techniques in Northland waters – and a very special encounter where an orca appeared to offer a stingray it caught to an underwater photographer.

Dr Visser spoke to Corin Dann.