OK. I'm good with that. ... actually, I gave some thought in bed as to whether 'dinosaur' or a species itself should be an objective definition or a theoretical definition. ... Dinosaurs did exist, dinosaurs do exists... Indeed, it's you're field; you can choose which you want. Once my own ancestry was questioned by someone offended by the existence of dinosaurs. If you make them objects in a theory, you can say 'They did, and they do exist.'  -) Thank you both for the wonderful discussion.