@foxnews: A Florida mom was swimming in a river when an alligator suddenly attacked, setting off a desperate fight to survive. Now, chilling 911 recordings reveal the chaos that follows. "She lost half an arm," one caller told dispatchers as witnesses rushed to help the severely injured 58-year-old. Dina Spann survived but lost her right arm below the elbow and part of a finger on her left hand. One boater's quick thinking may have saved her life. See how the rescue unfolded at the link.