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The Blue Whale (Balaenoptera musculus) is the biggest whale and the biggest animal that ever lived on Earth. It is also the loudest animal on Earth - even louder that a jet plane. When Blue Whales breathe (through 2 blowholes), their blow is a stream that rises 40-50 feet (12-15 m) above the surface of the water.

These gray-blue whales are found worldwide, living near the surface of the ocean in small groups called pods (or living individually). The Blue Whale is in danger of extinction.