Visitors to the holiday lights display "ZooLights" walk through a tunnel of lights at the Lincoln Park Zoo in Chicago, Illinois, December 17, 2013. Picture taken December 17, 2013. REUTERS/Jim Young ... more 
Visitors to the holiday lights display "ZooLights" walk through a tunnel of lights at the Lincoln Park Zoo in Chicago, Illinois, December 17, 2013. Picture taken December 17, 2013. REUTERS/Jim Young (UNITED STATES - Tags: SOCIETY) less 
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Reuters | Photo By JIM YOUNG / REUTERS
Wed, Dec 18, 2013 9:54 AM EST