BINGO!...lol....It has nothing to do with them keeping their jobs.....*eyes roll*....
Lemmings have become the subject of a widely popular misconception that they are driven to commit mass suicide when they migrate by jumping off cliffs. It is not a deliberate mass suicide where the animal voluntarily chooses to die, but rather a result of their migratory behavior. Driven by strong biological urges, some species of lemmings may migrate in large groups when population density becomes too great. They can swim and may choose to cross a body of water in search of a new habitat. In such cases, many drown if the chosen body of water happens to be an ocean, or is in any case so wide as to exceed their physical capabilities.