Bioscience:Nature Works — Migration
For animals， migration is a matter of survival. It is not so they need decide to do， but their form behaviors. This seasonal movement from one habitat to another is an adaptation to an environment. Animals migrate for a lot of different reasons. Same animals migrate to find food or a place for hibernate， other migrate to look for mate， give birth， or raise their young.
- Added：2006
- Country：America
- Duration：15
- Time of update：2011/8/17 16:54:12