Lol. Let me clarify a little; I'd written that just as a woke up. Our ability to feel comes from the nervous system. There's no significant physiological difference between you and I that would imply I can feel, but you can't. Same with most animals. Cows, chickens, and pigs. They all have brains and nervous systems that work the same way ours do. On top of that, one can see that these animals are pained by something harmful, that they're happy when they're being pet, etc. Some animals, scallops I believe, only have nerve ganglia (clusters of nerves), so whether that's enough to show sentience, we're not sure. Bacteria and plants don't have brains or nervous systems. So unless there's another way something can feel, they're not sentient