Thunderhead (foaled 1949) was a French Thoroughbred racehorse and sire, best known for winning the classic 2000 Guineas in 1952. He won once as a two-year-old and showed improved form in the spring of 1952, winning the Prix de Fontainebleau before recording an emphatic win over twenty-five opponents in the 2000 Guineas. He then finished second when favourite for the Poule d'Essai des Poulains and ran poorly when strongly-fancied for the Epsom Derby.
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