This is one of the many good reasons to follow Torah. Our Creator knows what is good for us, including which animals are good for 'food' and which ones are not. He also gave us instructions about seed-mixing (i.e. GMOs, etc.) that we, today, ignore along with all the other prohibitions on eating animals that carry disease. Now they put spider silk in milk, pesticides and hormones and who-knows-what in our food, chemicals as preservatives, and modify genetics so that seeds cannot reproduce themselves. Why do you suppose Americans lead the world in preventable disease? We are at the mercy of our own complacence. Eat Organic and Kosher and feel better.