The lemming is a small, mouse-like rodent. This life cycle controls the rhythm of most animal life on the tundra. Their many predators include ermines, foxes , snowy owls , weasels , gyrfalcons, and jaegers. These small mammals live less than 2 years in the wild. There are about a dozen lemming species worldwide.
Lemmings make paths through the grass, under roots or under snow, called runways.
They use these runways for shelter and for finding food.