The John Heinz National Wildlife Refuge at Tinicum is administered by the Department of Interior's U.S. Fish and Wildlife Service and is located in Philadelphia and Delaware Counties, Pennsylvania, about 1 mile from the Philadelphia International Airport. The refuge was established by an act of Congress in 1972 to protect the last 200 acres of freshwater tidal marsh in Pennsylvania. When acquisition is complete, it will consist of 1200 acres of varied habitats. Over the years, the refuge has become a resting and feeding area for more than 280 species of birds, 80 of which nest here. Fox, deer, muskrat, turtles, fish, frogs and a wide variety of wildflowers and plants call the refuge ''home''.