Animals are rarely known for their suicidal tendencies. Perhaps because when your daily thought pattern is limited to eat-sleep-defecate, there's no time for existential exegesis or contemplating the futility of life. That is, except for the lemmingâa small, furry, gerbil-like rodent that has come to be defined by its alleged tendency to mindlessly kill itself by jumping off of cliffs. However, the long-lived myth actually has its roots in Hollywood trickery.
Populations of lemmings fluctuate dramatically, from massive herds to near extinction. For years, theories on these populace peaks and plummets varied from the supernatural to the absurd. As reported by ABC News in 2004 :
That was before the modern meaning gained traction: That populations tumbled because packs of lemmings would occasionally run head-first off of cliffs, plunging to their self-induced death for no apparent reason. To refer to an individual as a lemming thus became synonymous with calling them a follower of a large group--a community on an unthinking course towards mass destruction.
However, this does a disservice to these cuddly hamster-lookalikes.
It turns out that there is no proof that an assemblage of wild lemmings would actually drive themselves off of a cliff at all, but rather the myth was perpetuated by a 1958 Disney documentary called White Wilderness , in which the filmmakers manually ran a pack of lemmings off of a cliff to make for good television. The staged suicide turned out to be a critical success, as the movie went on to win the Academy Award for Best Documentary Feature. See a clip of the film below.
During the cliff-diving sequence, the pocket-sized creatures cascade into thin air, tumbling backward and flailing their Lilliputian limbs a la Mufasa in The Lion King , before they land with a distinctive splash in the Arctic Sea. The survivers then swim deeper into the vast body of water, where the narrator speculates they will soon drown.
Since White Wilderness , this erroneous misnomer has finagled its way into the present-day lexicon, including being referenced in a 2008 US Senate campaign ad , as well as a song by  Blink-182 .
While a definitive explanation for the waxing and waning lemming communities remains unknown, recent speculation suggests their explosive annihilation can be attributed to the variety of predators they attract, including the stoat âa short-tailed weasel that's even capable of hunting lemmings beneath winter snow beds.
As the narrator of the documentary, Winston Hibler, suggests: "In this land of many mysteries, it's a strange fact that the largest legends seem to collect around the smallest creatures."
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