Click the image to see the NPR story.
This throws scientists for a loop, because the prevailing theory is that the big T. Rex's huge head, short arms, long legs, and other features evolved over time as it grew bigger. But this little guy has those features, too. Huh!
"Raptor Rex" (as it's being called) is truly tiny - about the weight of a human, only longer because of the tail. The T. Rex we all know and love was 100 times as massive.
Welcome, Raptor Rex!