Lemmings have gotten a bum rap as being panicky rodents prone to throwing themselves from cliffs during their annual migration. But it turns out that the "documentary" that first promulgated this lie was more snuff fantasy than scientific fact. You don't normally expect that from a Disney production.
We've all heard that lemmings jump into the sea every year, drowning themselves because they are just following the herd. Except they don't. That's actually a myth invented for a Disney wildlife documentary, and it has blinded us to the truth about the weird lives of lemmings for decades.