Why on earth should you explore the mesmerizing nature documentary "Earth"? How much time do you have on earth so I can explain this to you? OK, I will not elongate my review exploration on "Earth" to infinity, but I must stand my ground on why this is a "must see". The documentary takes a nature round trip on the migration paths on three animal families: a female polar bear and her cubs with the real life subplot of the father bear daring it out to hunt for food in his isolated path, a mama of a whale with her baby whale taking a whale of a migration tour for prey, and an elephant mama with her small (maybe not so small, they are elephants) offspring migrating in Africa. Directors Alastair Forthegill & Mark Linfield did an "out of this earth" job in also capturing the survival skills of many other animal species besides the magnetic shots of our three animal family protagonists. The cinematographically skilled team of Richard Brooks Burton, Mike Holding, Adam Ravetch, and Andrew Shillabeer were animales in camera shooting the wondrous nature sites and animal instinctive behaviors; not to mention, the slo-mo animal prey shots were u n b e l i e a v a b l e. "Earth" is also a lesson learner on the global warming effect on the animals; the papa polar bear in the doc is the poster animal boy on that consequence. So fellow earthlings, it is time to take the documentary voyage to visit "Earth" today! **** Good

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