New David Attenborough Documentary Features Orcas Hunting Humpback Whales

"Three humpback whales with a combined weight of 100 tonnes battle with a pod of five tonne orcas, also known as killer whales, as they try to take a humpback calf." Read more about the footage captured off Western Australia's Ningaloo reef for the new BBC television series 'The Hunt' (with video): 
http://www.bbc.com/earth/story/20151029-epic-orca-hunt-caught-on-camera