I have a strong suspicion that a lot of humans aren't conscious. The full p-zombie solipsist theory clearly isn't true, because the concept of consciousness wouldn't have arisen if nobody had it. But that doesn't mean everybody has to have it.
Nonhuman animals? No idea. We don't even know how to phrase the question rigorously, let alone how to even conceptualize answering it.
Nonhuman animals? No idea. We don't even know how to phrase the question rigorously, let alone how to even conceptualize answering it.