Excerpt from Race or Mongrel
In scientific usage the result of a fertile cross between two distinct species is called a hybrid; the result of a fertile cross between two varieties of the same species is called a mongrel. As, however, the distinction between species and varieties is one, not of kind, but of degree, varieties being species in the nascent stage and species having aboriginally existed as varieties, the distinction between, hybrid and mongrel is also one of degree.
In nature the hybrid is very rare, species shun crossing , instinctively. In captivity the crossing of animals, not of the same variety, is sometimes brought about by man, by the employment of ruse or force.
From the study of biology we learn that -
Crossing in nature is extremely rare. Animals as closely related as hare and rabbit rarely breed together.
When species are crossed fertilization rarely follows.
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