What is "moonax"

Moonax (1991–2004) was an Irish-bred, English-trained Thoroughbred racehorse and sire. In 1994 Moonax became the first horse to win both the Classic St Leger and the Prix Royal-Oak and was named European Champion Stayer. He remains the only three-year-old to have been honoured in this way. He stayed in training until the age of six, winning only two more races, but finishing second in four Group One races. In his later career he acquired a reputation for unpredictable and sometimes dangerous behaviour and was described as "the world's naughtiest horse". He was most unusual as a Classic winner who was raced over hurdles. He died in 2004 at the age of thirteen.