Animal Migration

Animal Migration Seasonal or periodic movement of animals in response to changes in climate or food availability, or to ensure reproduction. Migration most commonly involves movement from one area to another and then back again. This round-trip, or return migration, may be of a seasonal nature. Or it may require a lifetime to complete, as in various species of Pacific salmon that are born in freshwater streams, travel to ocean waters, and then return to the stream where they were born to breed before dying.
Migration is the periodic movement of an animal from the place where it has been living to a new area and its subsequent return journey to the original home. When animals migrate, it is usually to find abundant food and a good place to breed.
These seasonal movements of animals are one of the most incredible elements of nature.
The movement of migratory animals usually corresponds with seasonal changes. Many animals migrate to northern regions during summer months. The long summer days in the northernmost portions of the world ensure a good food supply. As fall and colder weather approaches, many animals migrate south to find warm winter weather and available food.
Many scientists view animal migration as an adaptation. Animals that have learned to move to optimal environments are the ones who have survived to continue their species.
Migrating animals usually use the same routes year after year--from generation to generation. Land animals cross mountains, rivers, and vast tracks of land. Birds, bats, and insects fly long distances, sometimes crossing entire continents or oceans. Swimming animals frequently migrate half way across the world.