Blue whale is considered the largest predator alive with a length of 30 meters and a weight of 170 tons . They gain weight very quickly , as much as 90 kilograms every hour. The Indian Ocean near the island of Sri Lanka stands as a cross board for all kinds of migrating marine life and for blue whale too as they are almost continuously on the move . They can dive down in a depth of two kilometers and their diet of every day is about 36,000 kilograms of krill.
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