The American Thoroughbred race horse Birdstone won which leg of the Triple Crown in 2004?
Summer Bird: Summer Bird (April 7, 2006 – December 23, 2013) was a champion American Thoroughbred racehorse, son of 2004 Belmont Stakes winner Birdstone. Belmont Stakes:  The race, nicknamed The Test of the Champion, and The Run for the Carnations, is the third and final leg of the Triple Crown and is held five weeks after the Kentucky Derby and three weeks after the Preakness Stakes.
the third and final leg