Population Dynamics
The population density of lemmings shows extreme peaks interspersed by years of very low densities. In peak years, wood lemmings migrate from overpopulated areas to areas of low population density. The migration usually begins around the end of July and ends in early October. The migratory distances are typically quite short, ranging a few kilometers at most, with no specific direction. If geographical features do not allow the animals to disperse evenly during their migration, then thousands of lemmings can be seen on their migration. This migratory behavior was exaggerated in popular stories about lemmings; innumerable numbers dash down the hillsides and fall down over rocks into the sea, only to drown. However, such stories of mass suicides in lemmings are mere legends. The size of home ranges between male and female wood lemmings varies greatly. Male home ranges (>2000 m2) are five to seven times larger than those of females.
Read more about this topic: Wood Lemming
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