A giant panda in a western Japan zoo celebrated his 28th birthday, considered over 80 years old in human years, on Monday with a cake made of ice and bamboo decorations adorning his enclosure.Male panda Eimei, born in Beijing, was recognized in 2014 as the world's oldest giant panda in captivity to produce offspring through natural breeding, according to the Adventure World zoo in Wakayama Prefecture.Since his arrival from China on Sept. 6, 1994, he has fathered 15 cubs at the zoo, and 11 of them have been returned to China, it said.The zoo gave the popular animal the decorations made of 28…READ FULL ARTICLE