Dinosaur behaviour
Although no human being has ever seen a live dinosaur, we know remarkably much of their behaviour: what they ate, what they did, how fast they walked, how they took care of their young .... What did dinosaurs do all day? Did they wander about on their own, in groups of in larger herds? How fast did they move, and where to?

Spectacular dinosaur tracks are found in Bolivia, near the capital of Sucre. Here hundreds of dinosaurs left their marks on the banks of a lake. The uplift of the Andes mountain range caused the layers with tracks to be pushed almost vertically. Here we have discovered the tracks of three different carnivorous dinosaurs, one large sauropod dinosaur, two species of ornithopod dinosaurs and ankylosaurs. The first six of these are relatively well known, but ankylosaur tracks were extremely rare until now. Here at Sucre there are three complete tracks, of which in the summer of 1998 this cast was made.

Ankylosauriërs were heavily armoured, plant-eating dinosaurs, with a large club on the end of the tail: a formidable weapon. In Spain too we find vertically placed tracks of Maastrichtian age. Dinosaurs of the same type as we have seen in Bolivia, France, and Romania have left their marks here as well.

How fast did Tyrannosaurus rex run?
The faster it goes, the longer the paces become. And vice versa, of course: the larger the distance between the tracks that we find, the faster the animal must have moved. In this way, we can ultimately determine the speed of movement of dinosaurs. Donald Henderson studies the ‘biomechanics' of Tyrannosaurus. His computer analyses presents a picture of how T. rex move and of how fast it ran.