Lemmus lemmus

During population peaks, Norway lemmings exhibit large scale dispersal. While many other rodents experience population peaks, Norway lemmings are the only species that will embark on long distance migrations. Their migrations have become famous through legends and stories. One common misconception is that lemmings set out on these migrations with the intent to drown themselves in the sea. Although mass drowning of lemmings do occur on these migrations (it is the number one cause of death on the journey), lemmings are not suicidal.