Some whales are bigger than the biggest dinosaur that ever lived, and some are graceful as dancers when they leap out of the water. A whale can swim through the water at dizzying speeds or dive as deep as a mile. A mother whale is a gentle and attentive parent who squirts as much as a hundred gallons of milk a day into the mouth of her hungry baby. And the strange, beautiful songs of the humpback whale have been captivating the world for centuries. Here is the whale - gentle giant of the oceans.