Vocab Break: A person who unthinkingly joins a mass movement, especially a headlong rush to destruction? lemming. Also, A small, short-tailed, thickset rodent related to the voles, found in the Arctic tundra.

https://en.oxforddictionaries.com/definition/lemming

1. 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 migrationsLemmings 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

lemminglike

play\ˈle-miŋ-ˌlīk\ adjectiveLured by stock prices defying gravity and handsome bond yields, Americans have marched into the funds in lemminglike fashion. — Penelope Wang and David Pauly

Origin and Etymology of lemming

Norwegian

First Known Use: 1713

https://www.merriam-webster.com/dictionary/lemming