Wrong. Simply put - B12 is found in bacteria in soil (where herbivores continue to get it). You would too, if you grew your own veg. But now all your lettuce gets washed in chlorine, packed in plastic and sold in supermarkets. So yeah, unless you grow your own, supplements are advised. But that proves nothing about the intentions of nature. Show me please the length of your small intestine compared with that of a cat, teeth, agility.... looking a lot like herbivores aren't we?