Why are there no unicorns?

Is that the song I was trying to think of? As to natural selection, they've never come across a life form or positive fossil of a life form which was two kinds or part one kind of animal, part another kind.. lots of species within a kind.. like breeders can breed other breeds of dogs.. but no cats have been bred from dogs, etc.. Just a little trivia most people don't know.. Also as to natural selection I don't see how a horn could be bad for their survival..? A unicorn would also most likely be be the same "kind" as a horse, zebra, etc.. Now if they thought of a unicorn as having evolved from the dog/coyote kind, it would be hard to survive during the transition when it is not an efficient carnivorous wolf kind anymore, nor an efficient (as to survival) unicorn. So.. I'm goin' for the song/poem.. and they perished along with Neanderthal man (Cain's kids). Or perhaps they are just shy creatures.. and if we could catch one, all our dreams would come true..

I never claimed they came across any fossils that suggest a breed of two kinds of animals. What I DID say is that they have come across fossils of animals which may have looked like a unicorn. For example: "One suggestion is that the unicorn is based on an extinct animal sometimes called the "Giant Unicorn" but known to scientists as Elasmotherium, a huge Eurasian rhinoceros native to the steppes, south of the range of the woolly rhinoceros of Ice Age Europe. Elasmotherium looked little like a horse, but it had a large single horn in its forehead. It seems to have become extinct about the same time as the rest of the glacial age megafauna."

these days those who are "qualified" to catch a unicorn are somewhat rare.

I'll buy one if you want to make a quick buck.

Plus their horn probably sells for like a million bucks.