Sure, I just think it's interesting, and that surely you do need to think about why you're interested in whether an animal 'makes' or uses 'tools' to know where

Sure, I just think it's interesting, and that surely you do need to think about why you're interested in whether an animal 'makes' or uses 'tools' to know where that cut-off should be, otherwise it's a bit arbitrary and self-fulfilling ('only humans and some apes use tools' ... 'where tool is defined as a manufactured object held in the hand'!) isn't it?