Evidence accumulating over the past decade suggests that some invertebrates — crustaceans, cephalopods, and possibly insects — have nociceptive systems complex enough to warrant welfare consideration in policy and practice.
The extension of moral consideration to invertebrates represents one of the most significant developments in animal welfare science. Billions of crabs, lobsters, shrimp, and cephalopods are killed annually under conditions that cause prolonged suffering if these animals are sentient. Humane slaughter methods — electrical stunning for crustaceans, rapid chilling for cephalopods — are feasible and increasingly adopted. Policy frameworks are needed to translate emerging science into regulatory protection.