This female Nuttall’s Woodpecker was the unfortunate victim of a window collision. Up to 1 billion birds die from window strikes in the U.S. each year, according to a 2014 study.
To reduce bird strikes, it is suggested to remove all bird attractants near the windows, carefully place bird feeders, or to partially cover the windows. Remedies are available according to the Bird Collisions Program of the American Bird Conservancy. The group offers extensive information on preventing collisions on its website.