In this handout image from the Zooilogical Society of San Diego, A giant panda cub Mei Sheng celebrates his second birthday by diving right into his...
Fu Ni the giant panda is treated to specially prepared panda treats for her birthday at the Adelaide Zoo on August 23, 2015 in Adelaide, Australia....
Knut the polar bear eats his one-year birthday "cake" at the Berlin Zoo December 5, 2007 in Berlin, Germany. Zoo officials celebrated Knut's one year...
Polar bear Knut is seen in his outdoor enclosure at the Berlin Zoo on December 5, 2008 in Berlin, Germany. The Berlin Zoo celebrates the 2nd birthday...
The world's most famous polar bear Knut eats his "birthday cake" on his fourth birthday in his snow-covered enclosure at the Tiergarten zoo in...
Funi the Panda enjoys playing with her birthday present to celebrate her first Australian birthday at Adelaide Zoo on August 23, 2010 in Adelaide,...
Giant panda twins Tohin and Ohin celebrate their first birthday at Adventure World on December 2, 2015 in Shirahama, Wakayama, Japan. The twin were...
Yuan Zai , the first Taiwan-born baby panda, bites a career card reading "teacher" while playing "Zhua Zhou", a traditional game played on a child's...
Madrid zoo celebrates the second birthday of giant panda Xing Bao, delivering a big bambu cake to Xing on September 5, 2015 in Madrid, Spain.
One year old polar bear twins Nobby and Nela and their mother enjoy a birthday ice cake during the cubs' first birthday party at the polar bears'...
Inuka, a male polar bear, has his birthday meal at the Frozen Tundra of the Singapore Zoo on December 16, 2015 in Singapore. Born on 26 December...
Giant panda Jia Jia eats a bamboo stick next to her cake made of ice and fruit juice to mark her 37th birthday at an amusement park in Hong Kong on...
Funi the Panda inspects her birthday cake to celebrate her first Australian birthday at Adelaide Zoo on August 23, 2010 in Adelaide, Australia. Funi,...