These are the famous swallows whose return from Villa Ventana, Argentina every year to the Mission San Juan Capistrano in California on (or around) March 19 is celebrated with a festival.
René wrote the song as a tribute to the annual springtime return of the Cliff Swallows to Mission San Juan Capistrano in Southern California.
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This character was first mentioned in a description of the beliefs of the native peoples who were associated with the Mission San Juan Capistrano in accounts written by the Franciscan missionary Jerónimo Boscana in the 1820s.