Invertebrate exhibits in zoos raise emerging welfare questions as scientific understanding of invertebrate sentience advances, challenging assumptions about which animals require welfare consideration.
Invertebrate welfare in zoo settings exists at the frontier of welfare ethics, where policy has not kept pace with science. Octopuses in zoo tanks may be particularly welfare-compromised - these solitary, highly active animals with large home ranges are typically kept in small tanks with minimal enrichment and unable to express their full behavioral repertoire. Crustaceans in touch pools are repeatedly handled by visitors, potentially causing stress and injury. Insect exhibits often maintain large numbers of individuals in conditions prioritizing display over welfare. As scientific evidence for invertebrate sentience strengthens, zoos must reckon with whether their current invertebrate practices meet appropriate welfare standards.