Lemmings Suicide Myth
One myth deeply entrenched in our language is that of the "Lemming Suicide Plunge" - where lemmings, apparently overcome by deep-rooted impulses, deliberately run over a cliff in their millions, to be dashed to their deaths on the rocks below, or to drown in the raging ocean. Indeed, this myth is now a metaphor for the behaviour of crowds of people who foolishly follow each other, lemming-like, regardless of the consequences. This particular myth began with a Disney movie.
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The myth of mass lemming suicide began when the Walt Disney movie, Wild Wilderness was released in 1958. It was filmed in Alberta, Canada, far from the sea and not a native home to lemmings. So the filmmakers imported lemmings, by buying them from Inuit children. The migration sequence was filmed by placing the lemmings on a spinning turntable that was covered with snow, and then shooting it from many different angles. The cliff-death-plunge sequence was done by herding the lemmings over a small cliff into a river. It's easy to understand why the filmmakers did this - wild animals are notoriously uncooperative, and a migration-of-doom followed by a cliff-of-death sequence is far more dramatic to show than the lemmings' self-implemented population-density management plan.
So lemmings do not commit mass suicide. Indeed, animals live to thrive and survive. Consider a company like Disney, where one rodent, namely Mickey Mouse, was Royalty. It's rather odd to think that Disney could be so unkind to another rodent, the lemming...
http://www.abc.net.au/science/k2/moments/s1081903.htm