More than one-third of the United States' threatened, and endangered species, live only in wetlands. Nearly half of them, are using wetlands at some point in their lives. Many other animals and plants, are depending on wetlands for survival. Estuarine and marine fish and shellfish, various birds, and certain mammals must have coastal wetlands to survive. Most commercial and game fish breed and raise their young in coastal marshes and estuaries. Menhaden, flounder, sea trout, spot, croaker, and striped bass are among the more familiar fish that depend on coastal wetlands. Shrimp, oysters, clams, and blue and Dungeness crabs, likewise need these wetlands for food, shelter, and breeding grounds. For many animals and plants, like wood ducks, muskrat, cattails, and swamp rose, the inland wetlands are the only places they can live. The beaver may actually create their own wetlands. For others, such as striped bass, peregrine falcon, otter, black bear, raccoon, and deer, wetlands provide important food, water, or shelter. Many of the United States' breeding bird populations, like ducks, geese, woodpeckers, hawks, wading birds, and many song-birds, feed, nest, and raise their young in wetlands. Migratory waterfowl use coastal and inland wetlands as resting, feeding, breeding, or nesting grounds for at least part of the year. There is an international agreement to protect wetlands. This agreement is developed because some species of migratory birds are completely dependent on certain wetlands and would become extinct if those wetlands were destroyed.