But Clarke has another clue that has provided a further piece of the puzzle. In the mid-2000s, she and her colleagues conducted a detailed examination of the preserved skeleton of an early type of bird found over a decade earlier by Argentinian researchers on Vega Island, a tiny scrap of land on the tip of the Antarctic Peninsula. The fossil itself remains partially embedded in a piece of rock, but using advanced CT scanning techniques, Clarke and her team were able to detect bits of the fossil hidden from view. They then digitally reconstructed the fossil from the scans.