[Sydney, December 23. Image via Getty.]

SYDNEY, AUSTRALIA - DECEMBER 23: A wallaby enjoys a festive
food Christmas treat at Taronga Zoo on December 23, 2009 in Sydney,
Australia. The Christmas-themed treats, enrichment gifts and festive
activities are designed to highlight the animals behavioural diversity
as the zoo prepares for the festive period. (Photo by Cameron
Spencer/Getty Images)