More than 99.9% of animals are invertebrates. There is modest evidence that some large groups of invertebrates, especially cephalopods and arthropods, are sentient. The effective animal activism community currently allocates less than 1% of total spending to invertebrate welfare. That share should rise so that we can better understand invertebrate sentience and investigate the tractability of improving invertebrate welfare.

This sequence is a sequel to Invertebrate Sentience. After having examined the minds of invertebrates, this sequence explores how we might be able to most effectively help them.