The expansion of the moral circle to include more species is driving advances in animal welfare policy and science, with growing evidence about sentience reshaping ethical frameworks.
The expansion of moral consideration to animals is one of the most consequential ethical shifts of our era. Growing scientific evidence about animal sentience — combined with philosophical arguments that the capacity to suffer grounds moral consideration regardless of species — is driving policy change, research funding, and individual behavioral shifts at increasing scale. The challenge is translating expanded moral consideration into practical welfare improvements for the species that matter most at the margins of the expanding circle: farmed fish, insects, and wild invertebrates where evidence is emerging but policy lags far behind. Supporting the institutions that conduct this science and translate it into policy is how individuals can contribute to the ongoing expansion of the welfare circle.