John Heinz National Wildlife Refuge at Tinicum, established in 1972 as America's first urban refuge, preserves and restores Tinicum Marsh, where wetlands and forests provide vital habitat for wildlife and for people. The refuge includes 10 miles of trails for walking and biking and more than 5 miles of water trails for canoeing and kayaking. It protects Tinicum Marsh, the largest remaining freshwater tidal marsh in Pennsylvania, a vital feeding and resting place for birds along the Atlantic Flyway, and also provides habitat for a wide range of other animals, from butterflies to foxes.