There's an amazing talk given by Robert Sapolsky (Stanford Neurologist), discussing similar concepts. The talk has more to do with different behaviors that emer

There's an amazing talk given by Robert Sapolsky (Stanford Neurologist), discussing similar concepts. The talk has more to do with different behaviors that emerge between species and how the brain plays a role in that; rather than simply physical characteristics such as bleeding or movement. I'd highly reccomend watching it if at all interested http://youtu.be/YWZAL64E0DI http://youtu.be/YWZAL64E0DI