 Questions about animal consciousness — in particular, which animals have consciousness and what (if anything) that consciousness might be like — are  both  scientific and philosophical. They are scientific because answering them will require gathering information using scientific techniques — no amount of arm-chair pondering, conceptual analysis, logic, a priori theory-building, transcendental inference or introspection will tell us whether a platypus, an iguana, or a squid (to take a few examples) enjoy a life of subjective experience — at some point we'll have to learn something about the animals. Just what sort(s) of science can bear on these questions is a live question, but at the least this will include investigations of the behavior and neurophysiology of a wide taxonomic range of animals, as well as the phylogenetic relationships among taxa. But these questions are deeply philosophical as well, with epistemological, metaphysical, and phenomenological dimensions. Progress will therefore ultimately require interdisciplinary work by philosophers willing to engage with the empirical details of animal biology, as well as scientists who are sensitive to the philosophical complexities of the issue. 