Fly South for the Winter

• Birds as well as land and water-dwelling animals migrate from place to place in a cyclical fashion. Weather and food sources make different areas more appealing habitats for specific species at certain times of the year. Birds fly south to warmer climates during winter in the Northern Hemisphere and return north when southern air is at its coldest. Many inhabitants of the African Savannah region, such as buffalo, also migrate regularly.
  
  

Human Emigration

• Humans tend to develop permanent dwellings and are less physically able to migrate regularly, so seasonal emigration is not common. Historically, human emigration springs from a lack of food or work. People move from an overpopulated or infertile land to somewhere offering more opportunities. Human emigration can also result from political or military force and for religious or family grouping.
  
  

Effects of Emigration on the Place of Origin

• Land and local wildlife become accustomed to migration patters of animal species. Plant life used as food and shelter for African water buffalo regenerates when the buffalo temporarily live elsewhere. Human agricultural practices spread nutrients and shape landscapes, leaving natural formations to reform as people depopulate an area. When some people leave a country, those remaining have more responsibility and a greater share in society's needs. Some governments today limit or restrict emigration.
  
  

Effects of Emigration on the Place of Arrival

• When you move somewhere, the population of that place increases. Food and other resources instantly become more scarce as a greater number of people depend on the same land and produce. Industries evolve as people compete more for established jobs and others have to create new ways to earn a living. Immigration, the act of entering a new place to live, can eventually lead to overpopulation and famine, which cause depopulation and perpetuate longer-term human migration patterns.