A polar bear dunks underwater at the family-owned Palmyre Zoo in the Charente Maritime region of France. (REUTERS/Regis Duvignau)

Schoolchildren hold candles and portraits of Nelson Mandela during a prayer ceremony in Chennai, India. (REUTERS/Babu)

A rare total-cloud inversion blankets the Grand Canyon National Park in Arizona. (REUTERS/NPS photo by Erin Whittaker/Handout)

Two girls sit inside the Life Line Trust orphanage in Salem, India. They are India's "Cradle Babies," products of a government program that permits parents to give their unwanted baby girls anonymously to the state, saving them from possible death in a region where daughters are seen as a burden. (Thomson Reuters Foundation/Mansi Thapliyal)

A woman takes a selfie in front of Christmas lights in Berlin. (REUTERS/Fabrizio Bensch)

Dancers perform in a national competition on the outskirts of Lima, Peru. (REUTERS/Enrique Castro-Mendivil)

Young rescued puppies cuddle in a small basket in Henndorf, Austria. (AP Photo/Kerstin Joensson)

In what may be the greatest college football game every played, Auburn cornerback Chris Davis (11) returns a missed field goal attempt 100-plus yards to score a game-winning, last-second touchdown over No. 1 Alabama. (AP Photo/Dave Martin)

A camel slated to appear in a nativity scene walks past the Library of Congress in Washington, D.C. (REUTERS/Jason Reed)

A road carves through sand dunes covered in vegetation in the Pilbara region of Australia. (REUTERS/David Gray)

An armed man walks toward the shores of Lake Turkana, near the Kenya-Ethiopia border. (REUTERS/Siegfried Modola)

Spanish four-year-old thoroughbred Nevisco III shakes his head during the Sicab International Pre-Horse Fair in Seville. (REUTERS/Marcelo del Pozo)

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