Named for a coastal town in the province of Guipúzcoa in Spain, Motrico was a descendant through his male line of English Triple Crown champion Flying Fox. He was five years old when he won the 1930 Prix de l'Arc de Triomphe and was then retired to stud duty. Less than successful as a sire, he was bought back to the race track in 1932 and in the fall became the oldest "Arc" winner when he claimed victory for a second time under jockey Charles Semblat.
As a sire, the best known of Motrico's offspring was Hanhof who won the 1944 Grand Steeple-Chase de Paris and a grandson named Vulgan who became an important sire of Steeplechase horses. His last foal was born in 1950.