Keo, a 55-year old chimpanzee that was the oldest living male at any North American zoo, was euthanized by doctors at the Lincoln Park Zoo in Chicago, USA, this week after a long bout with cardiac disease. Keo arrived at Lincoln Park in 1959, but lived predominantly off-view with two female chimpanzees for the final years of his life. For more, visit http://bit.ly/16X9DPS. http://on.fb.me/19gxPn9
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