To the Islands of the Sea Wolf
The expedition disembarks at one of Mexico's remotest island groups just as the sea wolves - the Californian sea lions - are pupping. The San Benito islands are also home to the northern sea elephant, an animal which has made a remarkable recovery from the brink of extinction, increasing its numbers 800-fold in 80 years.
The islands' storm petrels are of a kind found nowhere else in the world and yet they come ashore at night in millions, running the rare risk of dying at the hands of a strange cactus.
Producer JEFFERY BOSWALL BBC Bristol