This picture shows a plate from an 1865 lithograph of fossilized Hadrosaurus bones. Hadrosaurus lived in the late Cretaceous Period (around 70 million years ago). It was a herbivore (plant eater) and moved on two legs.

This drawing shows the possible appearance of Avaceratops, a dinosaur from the late Cretaceous Period. The first fossil remains of Avaceratops were found in 1981 in Montana, USA. Like other Ceratopsian dinosaurs, Avaceratops was a...

This drawing shows the possible appearance of Prenoceratops, a dinosaur from the late Cretaceous Period (around 80 million years ago). Prenoceratops fossils have been found in the US state of Montana. It belonged to a family of dinosaurs...