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These small rodents, which inhabit the Scandinavian countries, do not jump, but accidentally fall into the sea. Thus, the story that they run in groups to the edge of precipices and throw themselves into the ocean on purpose in a cinematographic collective suicide. Experts have come to the conclusion that this is due to population explosions that occur, on average, every four years. When the number of lemmings increases too much, there is a lack of food and they start, at the end of the summer or in the autumn, migratory movements in search of food. This displacement is not always orderly and many end up heading for the edges of cliffs and falling into the sea, pressured by the numerous flock of lemmings that come right behind them. “It is a natural survival strategy. If they stay in one place, they will starve to death. When moving, however, many fall and drown in rivers and lakes”, says biologist Peter Tuchin, from the University of Connecticut, in the United States.