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Arturo, the only polar bear in Argentina, lives in captivity at a zoo in Mendoza. The plight of the "sad bear" has spawned more than 400,000 signatures on a petition to get him moved to a "better life" in Canada.
July 19, 2014 Arturo the polar bear, living in a cramped and hot zoo enclosure in Argentina, is the subject of an online campaign that includes former House Speaker Newt Gingrich.
Lots of swimming in icy seas may have helped bears evolve to eat a high-fat diet yet remain healthy.
Sebastien Bozon/AFP/Getty Images
May 8, 2014 Baby polar bears slurp milk that's 27 percent fat, and adults dine on seal blubber. Scientists think bears' adaptation to a high-fat diet might lead to better ways to treat human obesity.
Polar bears are a great example of natural selection and evolution. But how did this ball get rolling?
Remko de Waal/AFP/Getty Images
March 18, 2014 Life, in all its forms, is amazing. Neil deGrasse Tyson captures some of this wonder in the latest episode of Cosmos. But commentator Alva Noë says he also seemed to avoid the biggest question of all.
A tranquilized subadult polar bear is in a net in 2007 in Churchill, Manitoba, known as the "polar bear capital of the world."
Paul J. Richards/AFP/Getty Images
September 10, 2013 A man in Churchill, Manitoba, saved his life by using the light from his cellphone to distract an attacking polar bear.
April 18, 2011 A momma polar bear burrowed under the snow on an island off the coast of Alaska, then settled in to hibernate. She later emerged and discovered the landscape she'd left was not at all like the one she returned to.
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