Scientists really need to stop splicing genes because the above photo shows a cat with four ears due to a genetic mutation.
The four ears on a cat can show up from time to time due to recessive traits. However, this recessive trait in cats only began to show up almost 100 years with the first known sighting of a four-eared cat occurring in Tennessee in 1927.
It's possible that these mutations were caused by various chemicals that were not banned a few years ago. For example, the banned pesticide Agent Orange that was used in the Vietnam War caused thousands of birth defects years after US soldiers were exposed to the chemical during battle.
This four-eyed cat would more than likely have no problem eating the three-eyed fish from "The Simpsons."