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Bookmark or Share- Do Lemmings Really Commit Mass Suicide? | BritannicaLemmings have large population booms every three or four years. When the concentration of lemmings becomes too high in one area, a large group will set out in search of a new home. Lemmings can swim, so if they reach a water obstacle, such as a river or lake, they may try to cross it. Inevitably, a few individuals drown.
- Lemming | Definition, Size, Habitat, & Facts | BritannicaLemming, any of 20 species of small rodents, some of which undertake large, swarming migrations. Lemmings are found only in the Northern Hemisphere. They have short, stocky bodies with short legs and stumpy tails, a bluntly rounded muzzle, small eyes, and small ears that are nearly hidden in their long, dense fur.
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