Sven Zacek / People in a cross-country skiing competition. Tartu, Estonia, Europe, February.
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Anup Shah / Wildebeest {Connochaetes taurinus} emerging from crossing the Mara river on migration, Masai Mara GR, Kenya. Wildebeest migrate annually a marathon distance of 1,000 miles!
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Sven Zacek / People in a cross-country skiing competition. Tartu, Estonia, Europe, February.
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Bryan and Cherry Alexander / Runners competing in the 2006 Antarctic Ice Marathon pass the start banner. Patriot Hills, Antarctica, January 2006.
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Bryan and Cherry Alexander / Runners competing in the 2006 Antarctic Ice Marathon pass the start banner. Patriot Hills, Antarctica, January 2006.
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Steve Knell / Arctic tern (Sterna paradisaea) in flight, UK. Arctic terns migrate annually a marathon distance of 7,200 miles
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Doug Perrine / Leatherback turtle with pilot fish {Dermochelys coriacea} Azores, North Atlantic Ocean. Leatherback turtles migrate annually a distance of 12,774 miles - the longest marathon on earth! (Non-ex).
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John Downer / Lions mating, male gripping female on neck {Panthera leo} Africa. Lions perform sexual marathon that might involve 300 copulations
