the Penshrew or Penguin shrew is a far more commen sight, they are also smaller then the Leviathans BUT! are still fearsome predators, hunting Otterseals, smaller sharks and even other migalecetus.
Even so, they do fall to the Shrewzilla.
they can be found all over the oceans and includeing the endless arctic oceans, also called the liminal ocean.
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