The National Forest System manages more than 170 forestlands and <a href=http://www.eoearth.org/article/Grassland_biome title=Grassland biome>grasslands</a>, which are available for activities such as camping, fishing, hiking and hunting.</p><p>The U.S. Fish and Wildlife Service manages more than 500 National Wildlife Refuges, which not only protect animal habitats and breeding areas but also