It is not at all certain that other animals do not develop consciousness. John C. Lilly's work with dolphins for instance points to a different conclusion. The

It is not at all certain that other animals do not develop consciousness. John C. Lilly's work with dolphins for instance points to a different conclusion. There are also other animals (parrots, elephants, various apes) that are widely believed to possess self-awareness if not near-human levels of consciousness.