Click here for "The 60th Report of the Colorado Bird Records Committee: A Report of Emperor Goose in Colorado."
Click here for the original study: "Isotopes in EMGO Primaries."
Stable isotope ratios of oxygen and hydrogen in primary flight feathers of emperor geese, sampled on the Yukon-Kuskokwim Delta (YKD), Alaska.
Study by Joel Schmutz, Research Wildlife Biologist for the United States Geological Survey (USGS) in Anchorage, Alaska.