Its name may translate as ‘king of the tyrant lizards’ but Tyrannosaurus Rex could not have outrun a speedy human, scientists have concluded, making a mockery of Jurassic Park.

Although it was previously thought the dinosaur could sprint at around 45mph, German scientists have discovered that the lumbering beast was so massive it would have struggled to accelerate beyond a medium trot.

In fact, researchers calculated that T Rex could only have clocked a running speed of 16.5mph, just one mph faster than the average human, and a 11 mph slower than Usain Bolt, the fastest man on Earth.

And the dinosaur certainly would not have been capable of keeping up with a moving Jeep, as shown in Spielberg's Jurassic Park.

However even Bolt could not have out-run a velociraptor, who would have been one of the fastest dinosaurs with the ability to run at 34 mph.