The largest animal ever existed is the blue whale, it have approximately 30 metres (98 ft) in length and 170 tonnes in weight. Elephant, the biggest animal in land only have 7 tonnes in weight. It's long body have bluish color so people gave name blue whale. Although it have large body, it's diet only on small crustacean called krill. Blue whale is animal that have conservation status EN, means Endangered, the population are under danger caused by it's number is declined. Population of blue whale worldwide is declined over time caused by hunting. Survey in 2002 revealed that there are 5000 to 12.000 blue whale worldwide.
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