A tiger has died at Zoo Atlanta

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Zoo Atlanta is in mourning after  Kavi, a 15-year-old male Sumatran tiger, died of old age. He was euthanized Thursday.

Born January 8, 2001, at Akron Zoo, Kavi moved to Zoo Atlanta in 2006, the Zoo said. He sired Sohni and Sanjiv, who were born to tiger Chelsea - shown in the video above - in 2011. At the recommendation of the Association of Zoos and Aquariums' (AZA) Tiger Species Survival Plan), he moved to Smithsonian's National Zoo, where he also fathered two cubs there in 2012. He returned to Zoo Atlanta in 2014.

MORE: Saying goodbye to the Zoo's panda twins