SYDNEY, AUSTRALIA - DECEMBER 21: A Sumatran Tiger cub investigates a wrapped Christmas present at Taronga Zoo on December 21, 2011 in Sydney, Australia. Animals received Christmas themed enrichment ... more 
SYDNEY, AUSTRALIA - DECEMBER 21: A Sumatran Tiger cub investigates a wrapped Christmas present at Taronga Zoo on December 21, 2011 in Sydney, Australia. Animals received Christmas themed enrichment foods as part of the Zoo's regular program to encourage the animals to forage for food and help improve hunting abilities. (Photo by Brendon Thorne/Getty Images) less 
1 / 30
Getty Images | Photo By Brendon Thorne / Getty Images
Tue, Dec 20, 2011 10:50 PM EST