Millions of birds die in building collisions. Madison volunteers want to help. - WPR

Millions of birds die in building collisions. Madison volunteers want to help.

Volunteer Ann Mader wears a bright vest and gathers materials to survey birds. She holds a map of the site, and has a backpack, canvas bag and net beside her.

As migrating birds fly south through Wisconsin, they encounter hazards that can be fatal – such as cats, wind turbines and windows.