The biggest bird to ever exist is a member of the same group of birds that includes the ostrich, the emu and even the extinct Moa of New Zealand. But this was by far the largest of all of this flightless birds. And around this creature is a mystery about exactly how and when this 1600 pound behemoth disappeared. I get to study how this animal became such a massive beast as well getting to see the monstrous egg that it laid. And we find out the very surprising answer to the question 'what is it's closest living relative today?'