User blog comment:SpaceGodzilla935/T-Rex VS Spinosaurus/@comment-5870856-20130817165048/@comment-1259419-20130817220900

an adult T. rex, as opposed to the juvenile in the movie

The JPIII T. rex was 11.5 meters long, that ISN'T juvenile! An average T. rex was 12 meters long (don't believe pages saying it was 15-17 meters!) The Spino was only 13 meters long, THAT is juvenile (it can reach 17 meters).

could have killed Spinosaurus.

Ofcourse, a T. rex could kill a Spino. But I dare say that in out of 10 battles, the Spino would win more.