Above is an image of a trace fossil of a potential dinosaur burrow. Dinosaurs may have used burrowing to protect them from polar winters in Australia. To view a video by Dr. Martin explaining the burrows, visit: <a href="http://www.youtube.com/watch?v=S8gahKh1l9A" target="_blank">http://www.youtube.com/watch?v=S8gahKh1l9A</a><br/>Credit: <em>Emory University</em>