According to legend, European lemmings (small rodents) migrate westward en masse, and when they come to land's end, they follow one another blindly off the sea cliffs and drown in the sea. Lemmings obey others' behaviour without thought or reason.
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soheil1So why he doesn't say blind obedience instead of lemming-like obedience?Why do you keep asking this same tiresome question? Speakers have options; that was his choice.
soheil1Does any other animal do the same kind of thing or just lemmings do this?Lemmings are notorious for it: hence the idiom.