Taking the opposing view.
We know the peoples, lands, and ethnicities are described as the sea in Rev. 17:15.
So perhaps this 'leviathan' is a representation of the fallen angel Lucifer.
..................................(pause)..........................................
.................(thinking)....................(pause)..........................
I don't think so.
For instance, in the very same book, Lucifer is described as an angel presenting himself to God.
- So now this angel becomes an aquatic serpent all of the sudden? - (In writing it's called a lack of continuity)
No, there were infact large reptiles before the flood, infact there were men of 'renown' before the flood,....
infact, many believe that is why God caused the flood, to wipe out the mutant species of 'ubermensch'.
- No way???? How about the mythological figures of Greece?
- Total figments, storybook fiction made up by a writer?
- Tell me, how often has a writer's prose been handed down from generation to generation by word of mouth?
No.........no, .....no,...... no ,.....no, .....no ,.....no ,......nope.......the the grecian mythological characters are the same as listed in Genesis 6:4 :
"There were giants in the earth in those days; and also after that, when the sons of God came unto the daughters of men, and they bare children unto them; the same became mighty men, which were of old, men of renown."
- Bish, boom, bam! All of the sudden we have a reason for a flood!