"Several scientists and philosophers argue that because invertebrates such as insects, spiders, worms and snails may very well be able to feel pain or suffering, our moral concern should be extended to such beings. Different kinds of evidence have been used to infer whether they can feel pain, including facts about their nervous systems, observations of behavior that indicate learning to avoid harm, and evolutionary arguments about whether feelings of pain would give a fitness advantage. Despite a growing number of studies on invertebrate pain, the evidence is not conclusive, which raises the political and ethical question of what to do under this uncertainty. The uncertainty supports that we should care about the potential suffering of invertebrates such as insects, and take and avoid at least some actions to reduce their potential suffering in case they can suffer. Potential invertebrate suffering is worth paying attention to, even if it is unlikely that they can suffer, primarily because of the large number of individuals involved and the severity of the harms that they endure. For instance, thousands of insects can be killed by boiling to produce one piece of silk clothing. This means that if such invertebrates can suffer substantially, their suffering would be a large-scale ethical disaster. In addition, the fact that invertebrates are so neglected should appeal to effective altruists and others looking to have an outsized impact."