Sentience Profile
Cephalopods and decapod crustaceans
Last reviewed: January 9, 2026
Summary
Many jurisdictions and scientific reviews increasingly recognize strong evidence for sentience in cephalopods and decapod crustaceans (e.g., learning, flexible behavior, responses consistent with pain). This has driven policy recognition in some places.
Supported by 2 cited sources
Evidence Summary
- Behavioral flexibility and evidence consistent with pain/avoidance learning. Evidence quality: Moderate–High Limitations / nuance: Details vary by species; “sentience” is a gradient concept for many scientists. Bottom line: Evidence supports serious moral consideration for cephalopods and decapods.
Supporting Evidence
Sources & Evidence
2 sources cited across 2 claims
1
Cephalopod and crustacean sentience is increasingly recognized
Systematic ReviewReview of the Evidence of Sentience in Cephalopod Molluscs and Decapod Crustaceans — Birch J, Burn C, Schnell A, Browning H, Crump A (2021)View source ↗
2
Behavioral evidence supports invertebrate sentience
Systematic ReviewReview of the Evidence of Sentience in Cephalopod Molluscs and Decapod Crustaceans — Birch J, Burn C, Schnell A, Browning H, Crump A (2021)View source ↗