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The periodic migration of Lemmings are unusual example of how to balance the nature is maintained within an animal population. These Lemmings inhabit the Oblique Tundra of Norway.
Lemmings reproduces very quickly. The breed from spring to fall and in favor over years even in winter. They live in corpses along rocks or short burst on the vegetation. A female may have between three and nine young in every little. Lemmings have a variety of natural enemies that includes hawks and wolves. During normal periods Lemmings make short annual spring migration in search of food and shelter.
Once a suitable area has found the Lemmings are settle in, and do two things necessary for survival. The first is eating, Lemmings subsist entirely on the root and shoots of plants. The second thing Lemmings do is reproduce as more and more individuals are born the food and water supplied begin to diminished every three to four years. The populations in some localities grow to great densities. In responses to us over crowding Lemmings exhibit a very specialize behavior. Individuals begin to migrate away from the centers of dense population. They group together and move in detectable way just across the country side.
Where ever varies to black the passage they tend to crowd in increasing numbers until a sort of panic reaction drives then over the obstacles. The migration impulse affects each individual driving them to keep moving if the stream or river interrupts there path they swim across. Many died during migration, perishing by predation starvation or accident.
Occasionally. some reach the ocean and plunge-in. Once again they begin swimming. They act on the same impulse that force them to cross smaller bodies of water. Swimming until exhausted all of them drown. Through this migration and the mass drowning the number of Lemmings has check. Scientist do not yet completely understand how these behavior has continued over the centuries when so many of the immigrating Lemmings die.
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