Harriet Tubman, an unsung naturalist, used owl calls as a signal on the Underground Railroad

Many people are aware of Harriet Tubman’s work on the Underground Railroad and as a scout, spy, guerrilla soldier, and nurse for the Union Army during the Civil War. Fewer know of her prowess as a naturalist.

At the Harriet Tubman Underground Railroad State Park in Church Creek, Maryland, Ranger Angela Crenshaw calls Tubman “the ultimate outdoors woman.” She even used bird calls to help guide her charges, eventually helping some 70 people, including her parents and four brothers, escape slavery.

Read more from Allison Keyes with Audubon Magazine here.