23 March 2017 Last updated at 10:34 GMT
Some of the first dinosaurs could have come from the UK.
This is according to new research by Matthew Baron, a scientist from the Natural History Museum.
He suggests that what we know about the evolution of dinosaurs, and where they first came from, might be wrong.
By looking at fossils Matt thinks that some of the first dinosaurs might have been around nearly 15 million years earlier that we thought.
And the exciting thing is, they could have lived around 245 million years ago in an area called Laurasia, which is now the UK.
A scientist has made an important discovery which could rock the dinosaur world.