Black Caviar is a champion Australian Thoroughbred racehorse who was undefeated in 25 races, including 15 Group Ones, an Australian record. She was the 2010, 2011, 2012, and 2013 WTRR World Champion Sprinter. Black Caviar was trained by Melbourne-based trainer Peter Moody. Other than in her first two runs and in one race in 2010, she was ridden by Luke Nolen. The mare was retired on 17 April 2013. According to an ABC Catalyst episode from 2015, she was never whipped.

Nijinsky was a Canadian-bred, Irish-trained champion Thoroughbred racehorse and sire. He was the outstanding two-year-old in Europe in 1969 when he was unbeaten in five races. In the following season, he became the first horse for thirty-five years to win the English Triple Crown, a feat that has not been repeated as of 2023. He is regarded as one of the greatest European flat racehorses of the 20th century.