Big Beasts features some of the world's most massive species filmed across 17 countries, including the gray whale, the elephant seal, the giant otter, the gorilla, the hippo, the brown bear, the ostrich, the orangutan, the tiger and the polar bear. Viewers will see that it's not easy being big — the larger the animal, the greater the challenges they face — as the series captures rare and first-ever footage using specialized equipment and next-generation filming techniques.