Welfare Science

Moral Circle Expansion and Animals

The moral circle describes the scope of entities whose interests we consider morally significant - its expansion to include more animals is a key ethical frontier.

Key Facts

Peter Singer's work in the 1970s catalysed philosophical engagement with animal moral status
Research suggests humans' moral concern for animals is influenced by perceived cognitive similarity
Sentience, not species membership, is increasingly argued to be the morally relevant criterion
Cultural variation in which animals are considered morally significant is substantial
Moral circle expansion historically follows increased understanding of consciousness and suffering

Welfare Considerations

Expanding moral consideration to a wider range of animals - including fish, crustaceans, and insects - has profound welfare implications. Education, exposure to animal cognition research, and philosophical engagement all contribute to moral circle expansion.

What You Can Do

Engage with philosophy of animal ethics literature to develop your thinking
Support organisations that promote evidence-based moral consideration of animals
Reflect on which animals you currently include in your moral concern and why
Advocate for policy that reflects scientific understanding of animal sentience
Share compelling animal cognition research with people who may be open to expanding their moral circle