comment: >
  
  So, a Pegasus would be totally out of the question.
context: This is a friendly reminder to read our rules.
  Remember, /r/Showerthoughts is for showerthoughts, not "thoughts had in the shower!"
  (For an explanation of what a "showerthought" is, please read this page.)
  Rule-breaking posts may result in bans. >
  
  The myth is unicorns have magical abilities not just the horn. >
  
  I was gonna say, Can a giraffe shoot rainbows out of its butt? >
  
  Yeah, you're right! Unicorns may not be as mythical as we thought they were, but they still make for a pretty cool addition to any fantasy world. On the other hand, Giraffes are pretty one-of-a-kind and definitely deserve more recognition for their uniqueness! >
  
  Sure but do giraffes have silver blood that grants the drinker immortality? >
  
  Yes >
  
  You would think that in millions of years that there have been horses, just one would have a genetic mutation for a single horn. >
  
  Not really. Even if growing a horn required only a handful of genetic changes, so long as half those changes result in a disfigured mess that won't reproduce, evolution won't produce a single horn. (Flip 6 base pairs, you get a unicorn, but any 3 and you get a mess) Evolution only works in small changes.