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This 2006 photo released by Roger Williams Park Zoo in Providence, R.I., shows Gloria, a gibbon, with her last-born female offspring, Mason, left. Gloria was euthanized Friday, Dec. 21, 2012, after suffering for months with a disease that had symptoms similar to those of Parkinson's. Gloria was born in 1983 at the Minnesota Zoo and has been at the Roger Williams Park Zoo in Providence since 1989. (AP Photo/Roger Williams Park Zoo)

Associated Press
This 2006 photo released by Roger Williams Park Zoo in Providence, R.I., shows Gloria, a gibbon, with her last-born female offspring, Mason, left.  Gloria was euthanized Friday, Dec. 21, 2012, after suffering for months with a disease that had symptoms similar to those of Parkinson's. Gloria was born in 1983 at the Minnesota Zoo and has been at the Roger Williams Park Zoo in Providence since 1989.  (AP Photo/Roger Williams Park Zoo)
This 2006 photo released by Roger Williams Park Zoo in Providence, R.I., shows Gloria, a gibbon, with her last-born female offspring, Mason, left. Gloria was euthanized Friday, Dec. 21, 2012, after suffering for months with a disease that had symptoms similar to those of Parkinson's. Gloria was born in 1983 at the Minnesota Zoo and has been at the Roger Williams Park Zoo in Providence since 1989. (AP Photo/Roger Williams Park Zoo)
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