For the more information about the geologic resources of the National Park Service, please visit http://www.nature.nps.gov/geology/.
The annual synchronized movements of millions of individuals participating in a journey that has repeated itself for thousands of generations, captivates the imagination. Migration is a strategy to survive, allowing wildlife to:
- Track seasonal food resources
- Escape dry seasons
- Avoid harsh winters
- Evade heavy predation during reproductive periods
Last Updated: December 15, 2010