Want to watch better-quality PBS Video? Sign in to access HD streaming!
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.
Upgrade Your Viewing Experience
This video is available to CallSign viewers with a Passport account. Passport gives you access to a wealth of premium content not previously available online, including full seasons of your favorite shows.