These are the animals with the longest migrations. In the Yukon, Porcupine caribou travel 3,000 miles. This is the longest migration by land of any mammal on Earth. Monarch butterflies fly about ...

Animal migration has fascinated humans for millennia. And for good reason: Some of the most astonishing feats of endurance are performed by long-distance migrants, such as the nine-day non-stop ...

These maps detailing variation in deuterium were ... Wassenaar, L. I. Tracking Animal Migration with Stable Isotopes. London, UK: Academic Press, 2008. Killingley, J. S. Migrations of California ...