Open ocean, a vast biotope covering two thirds of the planet, some shallow, some as deep as the mountain ranges are high. The ocean has an immense, precariously complex food chain, varying from microscopic animals, like krill, to whales, which ironically feed mainly on the former. Most species swim or float in it, many coming up for air, while other dive in from land or air, often to feed, but also to procreate on the coast, where some species come to lay their eggs. Even the shore is covered with life, largely based on organic matter, such as corpses.
Did You Know?
David Attenborough - Narrator
Away from all land, the ocean. It covers more than half the surface of our planet. And yet, for the most part, it is beyond our reach. Much of it is virtually empty, a watery desert. All life that is here is locked in a constant search to find food. A struggle to conserve precious energy in the open ocean.
Planet Earth Theme
Written by George Fenton
Performed by BBC Concert Orchestra See more