The passing of Frans de Waal marked a significant loss for the field of animal behaviour and cognition. His groundbreaking scientific work transformed our understanding of animal behaviour and influenced many scholars. De Waal’s popular science books reached millions, shaping public perception of animal minds and inspiring many young scientists. This memorial article reflects on de Waal’s profound impact on a new generation of animal behaviour scholars and the lasting legacy he leaves in the field of animal behaviour and cognition.