On St John's Eve (June 23), when the people make bonfires to purify their souls, giant dragonflies appear amongst the ashes. These dragonflies -the Caballucos- are the souls of sinners, and they come to release their fury over a year's worth of sins with fire and terrifying screams.
The Caballucos del Diablu appear in a variety of colors, each one being the soul of a different sinner. The red horse was a man who lent money to farmers and then used dirty tricks to steal their properties; the white one a miller who stole many thousands of dollars from his master; the black one a hermit who played tricks on people; the yellow one a corrupt judge; the blue one an innkeeper; and the orange one a child who abused his parents.
- Llano Merino, Manuel (2001). Mitos y Leyendas de Cantabria (in Cantabrian and Spanish). Santander: Ediciones de Librería Estvdio. pp. 141–143. ISBN 84-95742-01-2.
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