Maybe, but the interesting thing is that I think it identifies not just a difference of degree but of kind. For instance animals can use tools and build things

Maybe, but the interesting thing is that I think it identifies not just a difference of degree but of kind. For instance animals can use tools and build things and communicate and recognize self and so forth, where in each case humans dominate in the vast separation of degree we have taken each. I can’t think of any analogue where a vow would be a difference in degree to something. Maybe it’s along the ideas of abstract thought. I don’t know.