 With its flat head, long torpedo-shaped body, triangular flukes, wide flippers, and powerful tail, they're designed for life in the water. They can cover hundreds of miles before stopping for a bite to eat. You might be thinking, who cares? Well, this allows this massive mammal to migrate from the cooler polar waters to the tropics, where they mate and give birth in warmer water for their young. By not stopping, they'll cover thousands of miles very quickly. There's no way these design features could have just happened by accident.