Mutants

DO you realize that ancient people liked mutant creatures--like the bull-headed Minotaur, winged-horse Pegasus and more?
I don't understand why they keep 'making' stories which include these creatures. There must be at least one real creature among all of them...but which one?

The mutants seem to have different genes in their body, so that they have different characteristics. But some of them seem to be impossible, like the Chimera.

Mutants include half-breeds, trolls, dragons, etc...And giants. Giants, I think, could possibly exist. Because it’s just an overgrown human, and its actions are like ancient cavemen. So I do really think Giants exist...even now...

This is Circe, the witch who lived on a island near Greece, and transforms people who sail to her island to pigs...

I wonder if present science facts can solve this mystery...The genes of human don't change easily, and if this is not a legend, I don't believe magic can transform us into a lower-level mammal.

Circe may be a person who successfully researched the method of changing genetic systems...