David Attenborough looks at the world's coasts - dangerous frontiers ruled by powerful forces, where animals battle to survive amidst constant change.

Life in some of the many deserts and grasslands around the world, including in the baked Namib desert, where a pair of ostriches raise their family in the searing heat to keep them safe from predators. One troop of desert baboons are on a continual quest to find water and a young mother who is low in the pecking order must battle for her right to drink. Closer to the equator, in the grassland paradise of the Cerrado in Brazil, lives the rare, fruit-eating maned wolf, a bizarre creature about whom little is known.