the purpose of a representative democracy is a very inportantmatter in Australia and around the world. anyway the are thelargest animals ever known to have lived on Earth. Thesemagnificent marine mammals rule the oceans at up to 100 feet (30meters) long and upwards of 200 tons (181 metric tons). Theirtongues alone can weigh as much as an elephant. Their hearts, asmuch as an automobile.Blue whales reach these mind-boggling dimensions on a dietcomposed nearly exclusively of tiny shrimplike animals calledkrill. During certain times of the year, a single adult blue whaleconsumes about 4 tons (3.6 metric tons) of krill a day.Blue whales are baleen whales, which means they have fringedplates of fingernail-like material, called baleen, attached totheir upper jaws. The giant animals feed by first gulping anenormous mouthful of water, expanding the pleated skin on theirthroat and belly to take it in. Then the whale's massive tongueforces the water out through the thin, overlapping baleen plates.Thousands of krill are left behind-and then swallowed.