During the summers 1995/96, toxic nephrosis was diagnosed in nine free-living moose (Alces alces) from Aust-Agder County in southern Norway. Histopathological kidney lesions included tubular degeneration and necrosis, tubular regeneration, and interstitial fibrosis. The disease was probably caused by ingestion of the toxic plants, bog asphodel (Narthecium ossifragum) or oak (Quercus spp.).