And howsoever the matter we speak of is abominable, yet it is not fruitlesse, but helps much to the knowledge of some other things in the searching out of the secrecies of nature.
—Giambattista della Porta
Natural Magic, 1658
Many people are convinced that human hybrids, that is, hybrids involving human parentage, do not exist (other than ancient hybridization between various members of the genus Homo) and that they cannot exist. But it’s a head-in-the-sand mentality, given that there is actually quite a bit of evidence to the contrary (multiple eyewitness reports, videos, and even specimens). Perhaps it’s just that many people feel more comfortable denying the very possibility of such things than they do discussing the evidence of their existence. Obviously, the manner in which such things would come into being, would involve acts that would violate longstanding cultural and ethical taboos, something that most people simply do not wish to discuss. And yet, such information has great relevance not only for biology, but for humanity as a whole.
As indicated by the reliability arrow, the various types of human hybrids listed at right occupy a continuum between fact and myth. Some, such as pig × human or cow × human are closer to fact. Others, like bear × human and horse × human lie closer to myth.
Human Origins: Are we hybrids?
On the Origins of New Forms of Life
Cat-rabbit Hybrids: Fact or fiction?
Georges Cuvier: A Biography
Prothero: A Rebuttal
Branches of Biology