Intelligence has been attributed to a growing number of non-primate species, including birds, cephalopods, and jumping spiders. This review outlines key findings in animal intelligence, finding that there is significant support for the presence of a wide variety of intelligent capacities in these groups. Yet, how intelligence can be achieved with relatively small, non-mammalian brains remains an open question, and neuroscientific efforts have not established the relationship between brains and i
