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The producers and crew behind "Planet Earth" discuss their adventures while shooting the documentary series.
Polar-bear migrations are observed in this documentary examining frozen habitats.
Massive mountain ranges around the planet are explored. Included: the summit of Mount Everest; a look at mountain animals.
Examining ecosystems and their link to freshwater sources. Included: otters; crocodiles; snow geese; piranha.
Mexico's Cave of the Swallows is visited. Also: a look at the Lechuguilla cave system; stalactites, stalagmites and troglodytes.
Desert ecosystems are examined.
Frozen regions of the world, including the poles and the tops of mountain ranges, are explored. Featured: organisms that can survive in the coldest conditions on Earth. Narrated by Sigourney Weaver.
Grasslands, prairies, plains and savannas are examined, including areas of Mongolia, Africa and Papua New Guinea. Also: Arctic tundra.
Jungle ecosystems are examined. Included: animals indigenous to jungles, including primates and birds, and the unique plant life of these rich environments. Narrated by Sigourney Weaver.
Examining shallow seas that lie above continental shelves, where sunlight can reach the seabed. Included: the rich and varied aquatic life of coral reefs. Narrated by Sigourney Weaver.
Forests are examined, from California to Siberia to Madagascar. Included: different species of trees. Sigourney Weaver narrates.
Aquatic creatures are observed in their ocean habitats, including whale sharks, dolphins, crabs, eels and octopi.
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