Research into octopus cognition has revealed remarkable capabilities that have profound implications for how we think about invertebrate welfare and our treatment of these animals.
The cognitive sophistication of octopuses complicates simple frameworks for invertebrate welfare. These are not simple stimulus-response machines — they recognize individuals, remember past events, plan for future needs, and engage in what appears to be play. Whether this sophistication is accompanied by rich subjective experience remains uncertain, but the precautionary principle suggests that their welfare deserves serious attention. An octopus kept in a barren tank with no enrichment may be experiencing something more like boredom and frustration than a simpler animal would, given the evidence for their cognitive capacity.