KEARNEY, Neb., March 18 -- The University of Nebraska Kearney issued the following news release:

By TYLER ELLYSON

UNK Communications

GIBBON - Each spring, the distinctive calls of sandhill cranes echo across the Platte River Valley in central Nebraska.

More than a million of these majestic birds converge on a 70-mile stretch of the river, stopping to rest and refuel during one of the largest wildlife migrations in North America. For several weeks in late February, March and April, the cranes gather in vast numbers along the river, creating a spectacle that draws visitors from across the country and around the world.

The migration has become a defining feature of the region. According to a recent economic impact report from the Nebraska...