NATION NOWInternational Polar Bear DayPolar Bears International marks Feb. 27 as International Polar Bear Day. In recognition, USA TODAY Network brings you an assortment of polar bear images. Here, a polar bear cub at the Toronto Zoo eyes the camera.Toronto ZooThe Toronto Zoo's cub plays in his outside den in this February photo. The zoo is holding a naming contest for the young polar bear.Toronto ZooA zoo keeper cares for a new-born polar bear at the Ocean Aquarium of Penglai in east China in this 2012 photo.AFP/Getty ImagesYoung polar bear cub Anori takes baby steps at the zoo in Wuppertal, Germany, in this March 2012 photo. As part of International Polar Bear Day, Polar Bears International is encouraging the public to participate in its Thermostat Challenge to help reduce energy use and help preserve arctic environments.Oliver Berg, AFP/Getty ImagesYoung polar bear cub Anori snuggles with his mother, Vilma, in March 2012.Oliver Berg, AFP/Getty ImagesA polar bear cub at a zoo in Brno, Czech Republic, has a little fun in this March 16, 2013, photo.Radek Mica, AFP/Getty ImagesWhat did this polar bear get for Christmas? Food, of course, and he's eager to get to it in this Dec. 2013 image from the zoo in La Fleche, France.Jean-Francois Monier, AFP/Getty ImagesFreedom and Viktor, two polar bears at the Ouwehands Zoo in the Netherlands, play together on Jan. 23, 2014.Remko De Waal, AFP/Getty ImagesArturo, pictured here at his enclosure on Feb. 5, 2014, is the only polar bear in Argentina. Some activists have called for the aging bear to be moved to Canada.Andres Larrovere, AFP/Getty ImagesKali squints as he takes a stroll at the Alaska Zoo in Anchorage on March 22, 2013.Bob Hallinen, APAnori pokes her head above water at the pool in her enclosure at the zoo in Wuppertal, Germany, on April 17, 2012.Marius Becker, AFP/Getty ImagesGregor and Aleut, two young polar bear cubs, have some fun at a zoo in Nuremberg, Germany, on March 23, 2011.Daniel Karmann, AFP/Getty ImagesA polar bear looks on as another bear dons a bucket on his head at Moscow Zoo in 2010.Misha Japaridze, APPolar bears relax in northern Alaska in this undated photo.Steve Amstrup, U.S. Fish And Wildlife Service, Via APFeatured Weekly Ad