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to the myth, it is not a deliberate mass suicide, in which animals voluntarily choose to die, but rather a result of their migratory behavior. Driven by strong biological urges, some species of lemmings may migrate in large groups when population density becomes too great. Thus, the unexplained fluctuations in the population of Norwegian lemmings helped give rise to the popular stereotype of the suicidal lemmings, particularly after this behaviour was staged in the Walt Disney

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