Trying not to wake the sleeping giants | Blue Planet II
King penguins need to get past a natural barrier of elephant seals to reach their colony.
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Langurs free-running in the city | Planet Earth II
An alpha male langur takes part in a high speed chase across city rooftops to defend his females from marauding younger males.
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An Alligator's Song | Natural World
Male alligators serenade females by emitting a low frequency bellow.