Size--it really does matter, especially in the animal kingdom, where creatures battle it out, pound for pound. In this episode, Killer Instincts tips the scales with three giants: the Goliath grouper, the arctic polar bear, and the anaconda. Watch as these behemoths use their impressive girth to hunt, protect themselves, and survive.

Size--it really does matter, especially in the animal kingdom, where creatures battle it out, pound for pound. In this episode, Killer Instincts tips the scales with three giants: the Goliath grouper, the arctic polar bear, and the anaconda. Watch as these behemoths use their impressive girth to hunt, protect themselves, and survive.