Research on animal emotions has transformed understanding of animal experience, providing a scientific foundation for taking animal welfare seriously across species.
Animal emotions are no longer scientifically controversial at the level of core affective states. The SEEKING system — the drive to explore, anticipate, and seek reward — appears universal across vertebrates and even some invertebrates. Primary emotions like fear, play-urge, and social separation distress are demonstrable in fish, birds, and mammals. This scientific foundation makes the moral case for taking animal welfare seriously not just ethically compelling but empirically grounded.