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Sea-Bird was a chestnut horse with a narrow white blaze and white socks on his hind legs bred at the stables of his owner, the Lille textile manufacturer Jean Ternynck. Described by Timeform as "a tall, well-made horse", Sea-Bird was sired by the French Derby runner-up Dan Cupid, and trained, like his sire, in France by Etienne Pollet at Chantilly. None of his five immediate dams ever won a flat race, although his great-grandam Couleur did produce Camaree, who won the 1000 Guineas in 1950, and Sea Bird was more distantly related to the Belmont Stakes winner High Echelon.