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Queen Elizabeth II of England looks at a green stick insect held by Sue Street, when she opened the new Biodiversity Centre at the London Zoo in Regent's Park 03 June 1999. (Photo credit should read JOHN STILLWELL/AFP/Getty Images)

Queen Elizabeth II of England looks at a green stick insect held by Sue Street, when she opened the new Biodiversity Centre at the London Zoo in Regent's Park 03 June 1999. (Photo credit should read JOHN STILLWELL/AFP/Getty Images)