I hope one of the scientists here will correct me if I'm wrong, but I believe it is not well understood by science how instincts are encoded in DNA. But some genetic mutation probably started this instinct.
It seems to me that the parental instincts would have had to evolved a number of seperate times, as opposed to just once in a distant common ancestor, like the instinct to flee in the face of danger might have. There are fish and insects that just dump eggs, and then there is a spider that carries its little ones on its back, and the fish that shelters its young in its mouth. Of course mammals suckle their young, and most birds feed their young.
I guess I should note that I'm trying to understand evolution, but my true belief is that God gave this instinct.
Edited by InGodITrust, : No reason given.
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Edited by InGodITrust, : No reason given.