From the first bird-tracking study to technology 100 years later, scientists finally know where black-crowned night herons travel.
Early this morning, wild, migratory black-crowned night herons were seen for the first time this year returning to their nesting colony near the Zoo's Bird House—their only rookery in Washington, D.C.
Attaching transmitters to wild black-crowned night herons that nest at the Smithsonian's National Zoo's Bird House.