In Spanish and Latin American folklore, the tooth fairy has a murine counterpart named Ratoncito (little mouse) Pérez. The character wears a straw hat and glasses, carries a satchel over his shoulder, and collects children's baby teeth left under their pillows.

Origins in 19th-century Spanish literature

Ratoncito Pérez appears in various nineteenth-century books, most famously in an 1891 story by Jesuit and author Luis Coloma. Coloma wrote the tale at the request of Queen Regent Maria Christina of Habsburg for her then 8-year-old son, King Alfonso XIII, who had just lost his first baby tooth. In the story, the young king temporarily becomes a mouse and joins Ratoncito Pérez on an adventurous journey through Madrid, where they distribute money and small gifts to underprivileged children.

The mouse's home and modern museum

The story introduces the king to Ratoncito Pérez's family, who live in a cookie box inside a bakery on Calle Arenal in central Madrid. That location now houses the Casa-Museo de Ratón Pérez, a small museum where visitors can explore the history of the tale and the character's place in Spanish cultural tradition.