Species are artifical divisions, nature isn't that strict. If species worked 100% of the time there would be no evolution. Horses and donkeys can interbreed, t

Species are artifical divisions, nature isn't that strict. If species worked 100% of the time there would be no evolution. Horses and donkeys can interbreed, tigers and leopards too, and there are more examples, sometimes the ofsprings can breed too. Almost all rules in biology should have "except when not" added.