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Oldest rhino in the United States ‘Dolly’ dies at Knoxville zoo at age 56 (Video)

[youtube https://www.youtube.com/watch?v=sH6XSzwRsUM?autoplay=1&rel=0&controls=1&modestbranding=1] Zoo Knoxville said goodbye to a beloved southern white rhino named Dolly, who was the oldest rhinoceros in…