A wetland is an area that is covered by water for at least part of the year and has characteristic soils and water-tolerant plants. Examples of wetlands and their typical features include swamps (with tree species such as willow, cypress, and mangrove); marshes (with grasses such as cattails, reeds, and wild rice); bogs (with floating vegetation, including mosses and cranberries); and estuaries (specially adapted flora and fauna, such as crustaceans, grasses, and special types of fish that adapt, many of which adapt to the freshwater-saltwater environment).