Dr. Anthony Martin examines a trace fossil of a possible dinosaur burrow in Victoria, 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>