Writing the science fiction, 'Camouflage', gave me the opportunity to do research.
For one of the story-lines, I had to learn about unusual creatures real or from myth, that could exist in our lakes or oceans. Sometimes what popped up on my monitor literally scared me and I had to cover my eyes and just take a peek.
There was one in particular that I found so creepy, I'd pull it up just for a fright. It's called a Ningen. Described as a white humanoid creature of the Antarctic, it is said to be almost 30 meters/98.4 feet long.
Ningens may or may not exist-but fascinating creatures are out there. And some worked their way into 'Camouflage'.