One hundred years ago, Congress passed a law to protect migratory birds — but our feathered friends could be in danger after a Trump administration decision limited the law's effectiveness. We discuss why one of America's oldest environmental laws now faces a new legal battle, and what this could mean for the birds — and the environment. | Want to support 1A? Give to your local public radio station at donate.npr.org/1A and subscribe to our podcast. Have questions? Email the show at 1a@wamu.org and find us on Twitter @1a.