1.)there is a variety of slaughterfish called electric slaughterfish.
2.)appearently there is a law of magic that a scrolls of summoning has to represent the summoning in some fasion called the law of similarity. here's the quote.
"scrolls of summoning are, without exception, based on the law of similarity as you must know. While other use parts of the creature, such as daedra skin for summoning daedra, I have developed a new method, based on a recovered dwemer machine. my scrolls only have an image of the daedra, which works almost as well as a daedra skin or heart... and at a fraction of the cost" ---milyn faram
So tell us what obscure facts have you found that most might have overlooked?