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Only unusual circumstances can change this, primarily the compulsion of captivity or any other cause that makes it impossible to mate within the same species. But then Nature begins to resist this with all possible means, and her most visible protest consists either in refusing further capacity for propagation to bastards or in limiting the fertility of later offspring; in most cases, however, she takes away the power of resistance to disease or hostile attacks.
This is only too natural.
Even the most superficial observation shows that Nature's restricted form of propagation and increase is an almost rigid basic law of all the innumerable forms of expression of her vital urge. Every animal mates only with a member of the same species. The titmouse seeks the titmouse, the finch the finch, the stork the stork, the field mouse the field mouse, the dormouse the dormouse, the wolf the she-wolf, etc.