A Cotton-Top Tamarin inspects it Christmas cracker as they discover some gift-wrapped food treats and other tasty decorations in their exhibit at Taronga Zoo, in Sydney on December 9, 2014.  Animals at the zoo were quick to pounce on the festive-themed enrichment items prepared by keepers, showing off their natural foraging skills to uncover the food inside while some seemed just as happy playing with the cardboard box packaging.   AFP PHOTO/William WEST        (Photo credit should read WILLIAM WEST/AFP/Getty Images)