Green-tailed grebe

Green-Tailed Grebes are an endangered species of bird native to the area of Elwood City. As explained in "Elwood City Turns 100!", the Grebe population quickly dwindled and practically went extinct because of a loss of trees caused by the lumber town founded by Jacob Katzenellenbogan. However, a small number of them have survived to this day, and one was even seen in "For the Birds".

Several things in Elwood City are named after Green-Tailed Grebes, most notably the baseball team The Elwood City Grebes.