The Delaware Water Gap National Recreation Area encompasses 70,000 acres of ridges, forests, lakes and rivers on both sides of the Delaware River in the states of New Jersey and Pennsylvania. The Delaware River, the only remaining undammed river in the eastern United States, is part of the National Wild and Scenic River system; its exceptional quality waters provide both recreation and drinking water for millions of people in neighboring metropolitan areas. With habitats ranging from rivers and ponds to dry ridge tops, Delaware Water Gap is home to a variety of animals, from black bears weighing up to 800 pounds to ruby-throated hummingbirds, only 3-4 inches long. The Delaware River and its tributaries are home to more than 60 fish species, including both species that make the park their permanent home and migratory species such as eels and American shad that travel between the upper reaches of the river and the Atlantic Ocean. Great blue and green-backed herons wade in shallows looking for fish, frogs, and crustaceans for a meal. Otters glide silently through the water. On the river's floodplain, rich soil supports bountiful farm fields. Visitors can commonly see white-tailed deer and wild turkey searching for food. After nightfall, the park comes alive with a whole new set of animals: foxes, coyotes, bobcats, raccoons, and, in the night sky, owls, and six species of bats.