An American woodcock is being treated for injuries after colliding with a building in Chicago. (Courtesy Willowbrook Wildlife Center)

An American woodcock, one of the earliest migratory arrivals in Chicago, is recovering from a head wound and broken clavicle after colliding with a building in Chicago.

Migrating birds frequently are injured or stunned colliding with buildings in Chicago. (Courtesy of Chicago Bird Collision Monitors)

Chicago Bird Collision Monitors is recruiting volunteers to help rescue birds injured or stunned while navigating their way through downtown’s maze of confusing lights and glass buildings.

Since 2003, a group called the Chicago Bird Collision Monitors has made it their mission to collect birds that have been killed or injured after striking buildings and other structures.