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A filmmaker forges an unusual friendship with an octopus living in a South African kelp forest, learning as the animal shares the mysteries of her world.
This list rounds up some of the most popular and highly regarded nature documentaries of all time, spoiler alert--there's a lot of David Attenborough.
"The greatness of a nation" Mahatma Gandhi said, "can be judged by the way its animals are treated" and these documentaries show how we're doing against that measure.
Oceans cover more than two-thirds of Earth's surface, so the sheer number of documentaries that dive beneath the waves is hardly surprising.