If you haven't seen Blackfish the Movie yet, it is well worth watching.

It is a documentary that unravels the story of notorious performing whale Tilikum, who - unlike any orca in the wild - has taken the lives of several people while in captivity. So what exactly went wrong?

Shocking footage and interviews with trainers and experts manifest the orca's extraordinary nature, the species' cruel treatment in captivity over the last four decades and the growing disillusionment of workers who were misled and endangered by the highly profitable sea-park industry.

This emotionally wrenching, tautly structured story challenges us to consider our relationship to nature and reveals how little we humans have learned from these highly intelligent and enormously sentient fellow mammals.

I was surprised to learn how much social strife there is among killer whales at marine parks like SeaWorld. After so many years existing in these small confined pools, I thought they might’ve found a way to become a happy family. The reality is the opposite. There is constant conflict with nowhere to flee.

Watch the trailer here http://youtu.be/w2vG_Ifu4zg

Available to buy on DVD, BluRay and Download here http://shop.dogwoof.com/collections/blackfish/products/blackfish