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This is a submission towards the Anatomically Correct Series

The leviathan, (in biblical terms), is describes as being a colossal serpentine like creature, it’s back is covered in scales that are compared to the strength of shields. It is also capable of breathing fire and is capable of creating wave that are massive, but isn't capable of destroying a whole city.

The question I want to know is, what environmental pressures would cause for such a creature to exist?

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  • $\begingroup$ Star Wars lore has a lot to say on the internal structures of the planet Naboo; the ideal breeding ground for aquatic creatures of the scale and complexity that you have in mind. $\endgroup$ – Darius Arcturus Feb 9 at 3:03
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The late Cretaceous was a prehistorical period (right before that whole asteroid thing) that experienced a high level of oxygen saturation (35% to our 23%), high sea level, and warm temperatures. The warm temperatures are good for cold-blooded creatures (like serpents), the high sea level is good for aquatic creatures, and the high oxygen saturation resulted in some creatures which had poor respiration methods (like insects) being able to grow much larger than they can today. The world would have to be very lush, to facilitate lots of well-fed prey for this Leviathan to feast on. A barren world won't do.

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Some animals, like sharks and reptiles, keep growing until they die. The hypothetical leviathan, if were thousands of years old, would become massive.

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