We tend to think of imagination as a distinctly human ability. But already from Roman times, philosophers pointed out that animals can dream, and that dreaming involves the imagination. Today we have evidence from neuroscience and psychology that plenty of animals re-enact scenes from waking life while asleep. Having imagination indicates that animals, beyond their capacity to sense and feel, are fully fledged subjects. This finding makes it a lot harder  to argue that animals don’t have moral rights, argues David M. Peña-Guzmán.