Fact No. 5 Blue whale is the largest animal known to have ever existed on Earth, even larger than any known dinosaur. Adult blue whales can reach lengths of up to 100 feet (30 meters) and weigh as much as 200 tons or more. Despite their enormous size, they primarily feed on tiny shrimp-like animals called krill, consuming up to 4 tons of krill a day during certain times of the year.
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