Now then MMario! Use the same area of grass that supports the cow to grow a cereal crop and you can feed ten times as many people. Nice picture though, do the ricelings have cute little faces?
Pied Piper - I would not dream of imposing a vegetarian diet on everyone. As I said before I don't need meat, you are welcome to eat as you wish. However, the point needs to be made that we in the western world eat far more protein (of every sort) than we need simply because we can afford to.
I'm not sure how you define intelligence either but that must be a subject for another thread - we're already way off on this one.