Wally is family of the blue whale. Blue whales are the largest animals ever exited on earth. The interesting thing is that blue whales live of one of the smallest animals, plankton or krill. The largest plankton is about 1mm or 0.04inch long. The largest blue whale is about 30 meter or 100ft, or 30000 times larger. How does a whale get so big of such a small animal? The blue whale has developed a flexible jaw so that it can open its mouth to an extend never seen before. In a few seconds 70.000 liters of water, or the equivalent of a small swimming pool, flow in the whale’s mouth. The whale has a great filtering system, and a few second later the water flows out leaving the krill inside.