Lamiak help those who give them presents by providing them with help at work; if a farmer left them food at the river shore, they would eat it at night and in exchange would finish a field he had left unploughed. In some places, bridges were believed to have been built at night by lamiak: Ebrain (Bidarray, Lower Navarre), Azalain (Andoain, Gipuzkoa), Urkulu (Leintz-Gatzaga, Gipuzkoa), Liginaga-Astüe (Labourd). A lamiak is at the other side of the rainbow combing her hair. When the sun lights her hair, the rainbow opens.