Itzak bentov argues that consciousness is a continuum.  Stones have it, but at a very unrefined level.  Plants have it at a higher degree that stones.  Bacteria, amoebas, and protozoa have it at a higher degree than plants. Then bugs et al.   Animals have it at a higher degree than bugs.  Primates and dolphins are animals with more than others.  Then humans have it at a higher degree.  So most things 'have conciousness' according to bentov, but some have higher refinement of conciousness' than others.  Rather than saying some things have conciousness' and some don't, I agree with this approach.