2003-12-31, ScienceDaily: Working On The 'Porsche Of Its Time': New Model For Species Determination Offered Quote: ""...two species of dinosaur that are members of the same genera varied from each other by just 2.2%. Translation of the percentage into an actual number results in an average of just three skeletal differences out of the total 338 bones in the body. Amazingly, 58% of these differences occurred in the skull alone. ""This is a lot less variation than I'd expected"", said Novak...