Birds fly across the sky as St. Peter's Basilica is seen in the background, at the Vatican, Monday, Feb. 11, 2013. Pope Benedict XVI said Monday he lacks the strength to fulfill his duties and on Feb. 28 will become the first pontiff in 600 years to resign. The announcement sets the stage for a conclave in March to elect a new leader for world's 1 billion Catholics. (AP Photo/Alessandra Tarantino)

Associated Press
Birds fly across the sky as St. Peter's Basilica is seen in the background, at the Vatican, Monday, Feb. 11, 2013. Pope Benedict XVI said Monday he lacks the strength to fulfill his duties and on Feb. 28 will become the first pontiff in 600 years to resign. The announcement sets the stage for a conclave in March to elect a new leader for world's 1 billion Catholics.  (AP Photo/Alessandra Tarantino)
Birds fly across the sky as St. Peter's Basilica is seen in the background, at the Vatican, Monday, Feb. 11, 2013. Pope Benedict XVI said Monday he lacks the strength to fulfill his duties and on Feb. 28 will become the first pontiff in 600 years to resign. The announcement sets the stage for a conclave in March to elect a new leader for world's 1 billion Catholics. (AP Photo/Alessandra Tarantino)
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