see http://www.sciencedaily.com/releases/2011/06/110630073334.htm
Journal Reference: • J González-Solís, M Smyrli, T Militão, D Gremillet, T Tveraa, RA Phillips, T Boulinier. Combining stable isotope analyses and geolocation to reveal kittiwake migration. Marine Ecology Progress Series, 2011; DOI:10.3354/meps09233 ===============================
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