Spinosaurus may be the larges Theropod to ever stalk the Prehistoric Americas and believed to be even larger than T-Rex. Recently (late it was determined to be the first and only known aquatic dinosaur.
"I think part of the reason why we hold on to something so tight is because we fear something so great won't happen twice." Sad thing is that holding on will also keep a greater thing from coming. Fear should never be a motivation.