Established in 1849, the U.S. Department of the Interior (DOI) is the country s principal conservation agency that protects natural and cultural heritage. The department offers various recreational opportunities and conducts several scientific research activities. It conserves and protects fish and wildlife. The U.S. Department of the Interior (DOI) employs a staff of more than 65,000 individuals and over 235,000 volunteers. The department maintains nearly 2,400 operating locations across the United States and in Puerto Rico. It is responsible for managing a variety of water and underwater resources. The U.S. Department of the Interior (DOI) protects more than 1,900 endangered and threatened species. The department administers a project called Water for America, which is a multiagency initiative that helps communities meet the increasing demands on limited water supplies through collaborative projects, water conservation technologies and expanded information. In addition, the U.S. Department of the Interior (DOI) supports projects, such as Birds Forever, National Park Centennial, Improving Indian Education and Healthy Lands.