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.Tweet
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.
An Alligator's Song | Natural World
Male alligators serenade females by emitting a low frequency bellow.