2. North to the Golden Gate

Nigel Marven follows the grey whales up the Californian coast, spotting humpbacks, a unique fox and Californian condors en route.

3. Swimming with Giants

As the whales swim further into the cold seas of the Pacific Northwest, Nigel joins the Quileute tribe for their annual whale-welcoming ceremony.

4. Journey's End

The whales are now on the final stretch of their journey, with Nigel accompanying them all the way to the Bering Sea.