S1 E2: Humpback Whales

0:03:39 | Clip
Nature creates her own battles. In the waters around Hawaii, Humpback Whales complete a mass migration from northern feeding grounds; they are gathering to mate. But males outnumber receptive females, and a testosterone-fueled event known as the heat run sees a brawl of gargantuan proportions as the males clash for the right to mate.

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