Today it's all about T-Rex!
Second, scientists believe that Tyrannosaurus "could run down any other animal in its ecosystem":
The seven ton reptile, which was 13 feet tall and 40 feet long, was able to outpace any prey due to giant muscles located at the top of its tail.
Previously the tail had been thought of merely as a counterbalance to the weight of the beast's giant head.
Palaeontologist Scott Persons, of the University of Alberta in Canada, said: "Contrary to earlier theories, T-Rex had more than just junk in its trunk."
Researches didn't speculate about exactly how fast it could run, but if our favorite dinosaur-theme-park mogul is to be believed, it's 35mph. Kidding!