Wildlife adventurer Nigel Marven travels over 5,000 miles following grey whales on his very own Whale Adventure as they undertake the longest mammal migration on Earth.
Up and down the coastline, Nigel Marven meets whale-watchers, scientists and researchers.
It's a long and dangerous journey, through some of the world's most breathtaking scenery.
Nigel Marven sets out on another adventure, this time focusing on grey whales.
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.
The exact function of the narwhal's tusk has troubled scientists for years.
The spiral tusk typifies this extraordinary whale.
Dolphins are a kind of toothed whale and are incredibly intelligent.