Blue whales I watched a ducumentary about the ocean giants, whales, around the world this afternoon. The most interesting one is the blue whale. It is shown in the documentary that there is a large amount of blue whales near Sri Lanka, and it is the biggest mammal in the morld now which is as twice big as the biggest dinosaur ever existed. Incrediblly, the largest animal's food should be krills, the very small animals which live in the cold nutrient-rich water in Sri Lanka. Blue whales usually swim into the deep region where there are large quantities of krills. Then they open their mouths swimming up towards the shallow water. At last, they filter water out of their mouths.