(Feb. 25) -- Tragedy struck SeaWorld Orlando on Wednesday afternoon when a 40-year-old trainer named Dawn Brancheau was killed by an orca whale during the opening of a packed performance. Brancheau was recognized as one of the park's most seasoned trainers, and relatives have testified to her lifelong love for marine life, making the incident all the more heartbreaking. Now, Shamu Stadium has been closed indefinitely and an investigation begun into the possible causes of the fatality, leaving various media outlets and commentators asking, Why would a 12,000-pound, 30-year-old male whale named Tilikum suddenly snap, attack and kill his trainer?...