#DidYouKnow that there are strict rules for how scientific names are written? The 1st word (the genus) gets capitalized. The 2nd (the species) is always lowercase. In abbreviations, a period comes after the genus initial. So, the proper way to shorten Tyrannosaurus rex is T. rex! http://pbs.twimg.com/media/FKeExRdWYAE3ZfP.jpg