8. Leedsichthys - Often cited as the largest fish known to humankind, the largest Leedsichthys had an estimated length of 72 feet, but some researchers believe that it could have grown to sizes that would rival those seen in the blue whale, the largest known animal ever to live on planet Earth. Although Leedsichthys swam the seas only during the Jurassic Period, the group that it belonged to survived until the end of the Cretaceous Period. Remains of this filter feeder have been uncovered in England, France, Germany, and Chile.
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This post is part of the "Top Ten: Extinct Sea Monsters" series. For the rest of the posts in this series, click HERE.