The list of shuttle stallions that have truly been equally successful in both hemispheres is astonishingly short. In fact, it may really be a club of one.
It was the late, great Danehill who legitimized the shuttle concept in the 1990s by becoming an eight-time leading sire in Australia, but he also led the sire list in England twice and three times in France. Danehill has established multiple branches of his sire line in both hemispheres.