In a study by the ethologist H. B. Davis in 1908, raccoons were able to open 11 of 13 complex locks in fewer than 10 tries and had no problems repeating the action when the locks were rearranged or turned upside down.
Nun estudo feito polo etólogo H. B. Davis en 1908, os mapaches foron quen de abrir 11 dun total de 13 peches complexos en menos de 10 intentos e non tiveron problema en repetir a acción cando os peches foron resituados ou postos invertidos.