: any of various small short-tailed furry-footed rodents (such as genera Lemmus and Dicrostonyx) of circumpolar distribution that are notable for population fluctuations and recurrent mass migrations
- Lemmings are the locusts of mammals, and they will strip a habitat bare. Then, they begin migrating forward to find a new feeding ground, swarming over boulders, around trees, whatever stands in their way. If they run into a body of water, they try to swim across.
- —Natalie Angier
Lured by stock prices defying gravity and handsome bond yields, Americans have marched into the funds in lemminglike fashion.
—Penelope Wang and David Pauly