Due to what happens with our soil and environment, it's more and more common to give animals supplements of B12 and other nutrients. You'll find one of several sites confirming this - here.
I think this sheds some light on the theory that it's natural to eat animals, since we 'need' them for B12.
The bare facts seems to be that both plants and animals will be deficient in several vitamins and minerals because the soil is depleted from the nutrients we need. I think many meat eaters who might suggest that the vegan diet is unnatural since many vegans eat B12 supplements are not ware of the fact that the animals they eat also might be fed up on supplements and fortified food...
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