Wildlife adventurer Nigel Marven is traveling over 5000 miles, following gray whales as they undertake the longest mammal migration on Earth, up the Pacific coast of North America. From the warm winter birthing lagoons of Baja California, Mexico, a gray whale mother and her newborn calf must travel northwards to the icy seas of the Alaskan arctic. It’s a long, dangerous journey, past some of the world’s most breathtaking scenery, both under the water and above the waves. Up and down this coastline, Nigel meets whale-watchers and whale-worshippers, scientists, and researchers - characters who share his love for these magnificent…

Wildlife adventurer Nigel Marven is traveling over 5000 miles, following gray whales as they undertake the longest mammal migration on Earth, up the Pacific coast of North America. From the warm winter birthing lagoons of Baja California, Mexico, a gray whale mother and her newborn calf must travel northwards to the icy seas of the Alaskan arctic. It’s a long, dangerous journey, past some of the world’s most breathtaking scenery, both under the water and above the waves. Up and down this coastline, Nigel meets whale-watchers and whale-worshippers, scientists, and researchers - characters who share his love for these magnificent creatures. Along the way, Nigel also meets a fantastic array of critters. On land, he finds snakes, bears, eagles, and antelope, while out on the ocean waves he comes across a supporting cast of boisterous dolphins, playful sea lions, giant humpbacks, and deadly killer whales.