Marking the 100th anniversary of the death of the last passenger pigeon, Martha, at the Cincinnati Zoo in 1914, the special exhibit Going, Going, Gone? Endangered and Extinct Species explores how species go from enormously large populations to the brink of extinction or cease to exist altogether. It features one of the last known wild passenger pigeons, Buttons, who was found in Ohio and is part of the Ohio History Connection's permanent collection. Learn about species that are endangered and, equally important, what we can do to ensure their future existence. The exhibit concludes with a section on what we can do in our daily lives to reduce greenhouse gases and pollution and help prevent the extinction of currently rare species.