A donkey and a horse yields a mule, which is impotent. All taxa (species), which produce offspring but do not you continued lines are mixtures of taxa which will not blend. Hence, watermelon seeds which do not reproduce species cannot intermix because nature will not allow this to happen. Yet, it is interesting that we are all descended from the same ancestors--our species should mix unless we developed as punctuated equilibrium. Carl Sagan , Dragons of Eden A Minotaur was result of the mating between bull and a woman. Pliny thought that the ostrich was a cross between a gnat and a giraffe.
Come for a dose of inspiration from some of the greatest (and at times oddest) minds of history. The table is set. Come eat.