Could unicorns be real?

im wondering that cause if they mated with a animal that had a horn then it could happen or some scientists think that if u take DNA from a certain part of an animal mal that it will grow and the animal will get ust to it. so if we would take DNA from a that one fish from the ocean with a horn (i forget what its called). and then we inject the DNA into the horses head it might grow a horn. what do i think?