The park is located along a major migration route for migratory birds.
He would follow the old migration route, the way the ancient hunters had gone when they followed game into America.
Will humanity know much more about itself if we plot out human migration routes?
The river was used as a seasonal migration route by Indians.
These include: geographic location, migration routes, language and political structure.
These migration routes involved an expansion of the range as plant populations expanded from one area to another.
The lower Potomac is a natural migration route, especially for water birds.
But this year some of the normally crowded migration routes are nearly empty.
Despite decades of rapid urban development, it is still an important migration route for birds.
This island chain is an important migration route for birds.