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LONDON, ENGLAND - SEPTEMBER 26, 2017: Raven cages to house the iconic birds are beside White Tower at the Tower of London in London, England. Captive ravens have lived inside the complex for centuries. Their presence is traditionally believed to protect the Crown and the tower, officially known as Her Majesty's Royal Palace and Fortress of the Tower of London. (Photo by Robert Alexander/Getty Images)

LONDON, ENGLAND - SEPTEMBER 26, 2017: Raven cages to house the iconic birds are beside White Tower at the Tower of London in London, England. Captive ravens have lived inside the complex for centuries. Their presence is traditionally believed to protect the Crown and the tower, officially known as Her Majesty's Royal Palace and Fortress of the Tower of London. (Photo by Robert Alexander/Getty Images)