Ace underwater cameramen embark on a quest to film the most amazing stories of whales and dolphins in Ocean Giants.
Ocean Giants delves into the lives of the great sea-faring mammals, the cetaceans.
How well do you know Nigel Marven's quarry; the grey whale?
Nigel Marven sets out on another adventure, this time focusing on grey whales.
Up and down the coastline, Nigel Marven meets whale-watchers, scientists and researchers.
Following Canadian scientists as they uncover a buried skeleton of a blue whale.
One of the most wide-spread mammals on the planet, they inhabit every ocean.
A clip from the David Attenborough's Natural Curiosities episode A Curious Twist Clip.
Sir David Attenborough on the gigantic blue whale.
The spiral tusk typifies this extraordinary whale.