Ashley Cooper / A snow plough driving in heavy snow, clearing the road in Ambleside, England, UK. March 2006
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Wim van den Heever / Blue Wildebeest (Connochaetes taurinus) crossing the treacherous Mara River in the Masai Mara Kenya
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Matthew Maran / Hikers watching their feet as they walk over treacherous tree roots.The West Coast Trail, Pacific Rim National Park, Vancouver Island, Canada, September 2010.