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.
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 long spiral tooth sticking out the front of your face must be quite cumbersome.
Sir David Attenborough on the gigantic blue whale.
The exact function of the narwhal's tusk has troubled scientists for years.
The spiral tusk typifies this extraordinary whale.