Paleontologists at the University of Alberta have a new theory for why some dinosaurs stood on two feet instead of four. The researchers found clues in the tails of the ancient creatures' much smaller ancestors, proto-dinosaurs.
It's not easy following in the footsteps of the largest animals ever to roam Earth. There are no roads or even footpaths to get to the spot in Bolivia where researchers recently discovered a huge dinosaur footprint measuring 1.15 metres wide.
An analysis of prehistoric fossil shells in the Antarctic is lending further credence to a scientific theory that suggests a mass dinosaur extinction 66 million years ago is linked to a “one-two punch” of climate change and an asteroid impact.