Shallow Seas, Planet Earth Ep. 9

This programme is devoted to the shallow seas that fringe the world s continents. Although they constitute 8 of the oceans, they contain most marine life. As humpback whales return to breeding grounds in the tropics, a mother and its calf are followed. While the latter takes in up to 500 litres of milk a day, its parent will starve until it travels back to the poles to feedand it must do this while it still has sufficient energy left for the journey. The coral reefs of Indonesia are home to the biggest variety of ocean dwellers. Examples include banded sea kraits, which ally themselves with goatfish and trevally in order to hunt. In Western Australia, bottlenose dolphins hydroplane in the shallowest waters to catch a meal, while in Bahrain, 100, 000 Socotra cormorants rely on shamals that blow sand grains into the nearby Persian Gulf, transforming it into a rich fishing