I remember the pictures and videos, of what the sea life looked like, after the atom bomb tests in the South Pacific.  The UH had a special showing.

What was disturbing, was all of the mutations.

The professor then gave us some hope.  As long as a mutated male & a mutated female, doesn't give birth to a new species, then we are in good shape.

Giant & deformed crabs, were somewhat shocking.  Horror movies were probably made, as a result of them.  Giant roaches, seem to live anywhere in the world, under any circumstances.

Were the giant rats, part of radioactive mutations?