Its an interesting question, the collective Consciousness.
I always think of it as between Humans but perhaps that is big headed of me (and us as a species) to think that we are the only ones with Consciousness. I mean we've all seen the videos of Gorillas and Monkeys communicating with humans using sign language, so who are we to think we are the only ones? We know that birds can count and that elephants never forget so I mean maybe all the animals form part of the collective consciousness?
How do we even know that rocks and other inanimate objects don't have Consciousness?