Mute swans are not native to North America but were first introduced from Europe in the late 1800s. Consequently, they are an unprotected species in Pennsylvania. They begin breeding at two or three years of
age, and their population has grown to more than 9,500 swans in the Northeast. They mate for life, and both adults care for the young. The adults can be extremely aggressive when protecting their young. Mute swans consume large amounts of aquatic vegetation that other fish and wildlife species depend on for food and shelter. Mute swans usually have an arching neck as they swim.
Waterfowl have two primary habitat requirements. First, they need a permanent body of water on which to land, escape, rest, and roost. Second, they must have a suitable open feeding area that provides a place to land, has good visibility of the surrounding territory, and has abundant tender young grass and other vegetation for feeding. Mallards are primarily filter feeders and will consume almost anything edible. Swans eat aquatic plants, and geese eat a variety of terrestrial grasses.
All species will come on land to feed, typically twice a day, in the morning and late afternoon. However, they may feed at night if their normal daytime habits are disturbed. Normally waterfowl roost on open water at night.