Probably not. While there is still empassioned debate over just how big these creatures really were, it's generally supposed that the sperm whale, living today, was bigger, or at least more massive.
There are no modern equivalents of Liopleurodon. Liopleurodon was a 50 foot long, short necked plesiosaur (pliosaur) and an apex predator. They lived during the Jurassic, about 162 - 150 million years ago.
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The human is the biggest predator in the western hemisphere. The cougar is the second largest predator that can be found throughout the western hemisphere.
Badger
Giganotosaurus
YOU
RATS
humans
no sharks are
Anaconda.
It is the tiger shark
Humans are the biggest threat to wolves.