Zhonghe Zhou and Fucheng Zhang of the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing and Julia A. Clarke of the American Museum of Natural History in New York City made the assessment by comparing Archaeoraptor to the fossil bird Yanornis martini. Both the dimensions and anatomical features of the front half of the fossil forgery, including the legs, toes, and beak tip, correspond very closely to those of Y. martini, the team reports. In fact, once breakage is taken into consideration, they are nearly identical. The researchers also analyzed a third, previously undescribed specimen that was recently retrieved from the same fossil-rich region of China and determined that it was also a Yanornis. Digested fish remains preserved in the creature's gut provided scientists with a peek into Y. martini's dietary preferences.