This photo provided by the Chicago Zoological Society shows, Isis, a five-year old African lion at the Brookfield Zoo playing with one of the zoo's christmas trees that was hung upside down in the ... more 
This photo provided by the Chicago Zoological Society shows, Isis, a five-year old African lion at the Brookfield Zoo playing with one of the zoo's christmas trees that was hung upside down in the lion exhibit to be used as part of the society's animal enrichment program, Friday, Jan. 7 , 2011, in Brookfield, Ill. less 
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Associated Press | Photo By Chicago Zoological Society, Jim Schulz
Sat, Jan 8, 2011 4:20 AM EST