What, are lemmings retarded? Yes, mass suicide sounds like a wonderful evolutionary trait to have built into your species to ensure its survival. Lemmings do no such thing, except occasionally when they’re drunk at bachelor parties. This great misconception was perpetrated by none other than Disney, who, in all their evil, decided their early nature film “White Wilderness” would be much more awesome if it showed a bunch of rodents flinging themselves off cliffs. They were correct, of course, but that doesn’t make this “phenomenon” any less B.S.
[From Paul’s Ponderings – The Ten Biggest Misconceptions We Learn In School]