Secretariat (foaled in 1970). Demolished his rivals by 31 lengths in the Belmont Stakes to complete the Triple Crown. Popularly known as ‘Big Red’, the American Hall of Famer won 16 of his 21 career starts. Widely regarded as one of the top three race horses of all time and got his own Hollywood movie. Getty Images

Secretariat, Frankel and the top 10 race horses in history - in pictures