Why do you go on expeditions to Mongolia every summer?
The fossil-rich red hills of the Gobi desert.
It's probably the best place in the world to find dinosaur fossils that we have questions about. These fossils are evidence of the transition between what people have always called dinosaurs and what people call birds. So, thanks to our expeditions in Mongolia, we now know that animals like Velociraptor and other small carnivorous dinosaurs are related to birds.