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TED Talks
Ted: Ted Ed: Eli the Eel: A Mysterious Migration
James Prosek tracks the life journey of Eli the Anguilla eel as she travels her mysterious "backward" migration from the sea to fresh water and back again. [4:39]
Smithsonian Institution
National Museum of Natural History: Hall of Mammals: Caribou
Brief overview of the caribou and an accompanying photo illustrate the physical adaptations that allow this animal to migrate to find its food supply.