The fin whale is one of the fastest cetaceans in the world. It has been nicknamed 'the greyhound of the sea' on account of its streamlined shape and high speed. The fin whale can swim as fast as 56km/h (29mph) in short bursts, and can sustain a speed of between 37km/h (23mph) and 41km/h (25mph) over longer periods. Social structure More @Wikipedia
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