Tourism has undoubtedly had a negative impact on the Galapagos, bringing invasive new species and pollution. But humans have also been instrumental in conserving the species they almost wiped out.
Since the 1400s, humans have crippled giant tortoise populations by eating them and bringing egg-eating rats to the islands. One species of giant tortoise is now extinct after the last lonely specimen died recently of old age.
One thing that strikes all visitors to the Galapagos is how unfazed the animals seem by humans. This is because they have evolved without threat from any serious predators.
Diversity of animal life on the Galapagos islands has been influenced by the huge variety of micro climates. Land snails offer a perfect example.
David Attenborough looks at why no two islands in the Galapagos are the same. Featuring final footage of the islands' famous giant tortoise Lonesome George who recently died.
Africa is where the rules of life were written, where mankind first set foot and where an amazing array of life began. But now it faces the greatest changes in a continent that the world has ever seen.
A 6'7" Aussie who lives in a one-room tin shed in Alice Springs and spends his life saving orphaned baby joeys has become the toast of Britain...Since the program aired on the BBC, Brolga has become a reluctant star.
Once life arrived in the Galapagos, it exploded into unique and spectacular forms. David Attenborough investigates the driving forces behind such evolutionary innovations. We learn that life must be able to adapt quickly in these ever-changing volcanic landscapes.
David Attenborough explores the lives of the toughest species and shows how they manage to exist in the scorching wilderness of the Sahara desert.
More than 150 years after Charles Darwin formulated his ground-breaking theory of evolution on the remote archipelago, Attenborough explains how life on the islands has continued to evolve in biological isolation, examining how the ever-changing volcanic landscape has given birth to species and sub-species that exist nowhere else in the world.
Southern Africa is a riot of life and colour. But if it was not for two great ocean currents that sweep around and shape the continent's Great Cape it would be a desert.
The final episode explores the Andes - the longest continental mountain range in the world.
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