The bald eagle, the national bird of the US, is now flourishing after decades of threatened extinction. In this video from SciTech Now, see how the Mercer County Wildlife Center in New Jersey has taken steps to protect this national treasure. The bald eagle population in New Jersey was severely reduced upon exposure to the long-lived insecticide DDT. The Mercer County Wildlife Center has tracked nesting pairs, introduced more eagles into the area, and nursed sick and injured birds back to health to revive the eagle population in the state.