Director：Su Holden 

Performer：Scott Baker John Calambokidis Darlene Kenton 

　　Blue whale (academic name: Balaenoptera) musculus is an marine mammal, which belongs to the whale. the blue whale is considered to be the largest ever-survival animal on earth, 33 metres long and 181 tons heavy. 　　Blue whales are thin and gray in their backs, but sometimes they look light in water。 THERE ARE CURRENTLY AT LEAST THREE SUB-CATEGORIES KNOWN TO BE BLUE WHALES: B IN THE NORTH ATLANTIC AND NORTH PACIFIC. m. musculus; living in B of the Southern Ocean. m. intemedia and B in the Indian Ocean and the South Pacific. m. brevicauda. B found in the Indian Ocean. m. indica may be another subspecies. like other whales, blue whales are fed mainly by small crustaceans (e.g. krill) and small fish, and in some cases also by mackerel. 　　Until the beginning of the twentieth century, the number of blue whales was considerable in almost every sea area of the world. More than 40 years later, whales are almost extinct as a result of their hunting. It was only after the international community began to care for blue whales in 1966 that the number of blue whales rose. A 2002 report estimated the current number of blue whales in the world at 5,000 to 12,Between 1,000 and divided among at least five ethnic groups. Recent studies of midget blue whales suggest that this number may have underestimated the actual number. Before whaling began, the largest group of blue whales was in the Antarctic, estimated at 239,1,000 (range 202),000 and 311,Between 1,000)I don't know. Currently in the Northeast Pacific、The number of Antarctic and Indian oceans has been significantly reduced (about 2 each),Thousands. There are two larger groups in the North Atlantic and at least two in the southern hemisphere。