"Are there cognitive or emotional capacities that are unique to humans in ways that make us worthy of higher moral status? What sets one primate, including us, apart from another primate, cognitively speaking?"
http://news.yahoo.com/s/space/20050714/sc_space/moraldebateprocedurerisksmakingmonkeysmorehumanlike;_ylt=As3DKkc.Y1r0.0tyj3qjFzoPLBIF;_ylu=X3oDMTBiMW04NW9mBHNlYwMlJVRPUCUl