I was wondering...where exactly do animals like cows get their protein from, when they just graze all day? Grass has no protein, does it? And if it has any, it can't be enough to make a complete AA chain, can it? I don't get where the protein in cows and other animals comes from. It's like which came first, the chicken or the egg? 'cause I know muscles are made of protein, and we eat the muscles of the animal which contain protein...but where do THEY get it from?