Migration
In biology, the term migration refers to the regular, periodic movement of animals between two different places. Migration usually occurs in response to seasonal changes and is motivated by breeding and/or feeding drives. Migration has been studied most intensively among birds, but it is known to take place in many other animals as well, including insects, fish, whales, and other mammals. Migration is a complex behavior that involves timing, navigation, and other survival skills.
The term migration also applies to the movement of humans from one country to another for the purpose of taking up long-term or permanent residency in the new country.
Types of migration
Four major types of migration are known. In complete...
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