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David Attenborough explores how animals attempt to overcome the challenges that face them at each of the six crucial stages of life as they strive towards ultimate success - passing on their genes. Animals must find somewhere to live - a place that provides the necessities of life, shelter from the elements and a refuge from enemies. Home for a pack of African hunting dogs is a vast plain in Zambia, but it's far from safe. They must protect their young from predators and battle their age-old enemy - the hyena. Hermit crabs on an isolated tropical island make their homes in empty snail shells. But there is a severe housing shortage. When a new property washes ashore the crabs form an orderly queue, in order of size. It's a housing chain. When the chain is complete each crab moves into the newly vacated shell ahead of it in the line. Chimps have made a home on the edge of the Sahara desert. They only survive by knowing how to find water even in the most extreme droughts.