sentences:  Nestucca Bay National Wildlife Refuge supports one tenth of the world's dusky Canada goose population.The refuge contains at least seven types of habitat, including tidal marsh, tidal mudflats, grassland, woodland, pasture, forested lag—a transition between raised peat bog and mineral soil—and freshwater bogs, including the southernmost coastal sphagnum bog habitat on the Pacific Coast.The sphagnum bog provides habitat for many interesting and unusual species, such as the insect-eating sundew plant and the bog cranberry.