Lemmings do not engage in suicidal mass migrations; this is a long-standing myth that has been disproven by scientific evidence. Lemmings are small rodents typically found in tundra regions of the Arctic and sub-Arctic. They exhibit natural population fluctuations, and during periods of high population density, they may undertake migrations in search of food. However, these migrations are not characterized by the dramatic 'lemming cliff' plunge as often portrayed in popular culture.