Contained within the 3rd Edition (1957) of the Atlas of Canada is a map that shows the location and/or extent of National Parks, Provincial Parks, National Reserves and Preserves, Provincial Reserves and Preserves, as well as bird sanctuaries which are denoted as being federally maintained or maintained by other parties (usually private or municipal), circa 1958. The National and Provincial Parks are areas retained in their natural state for public use. Within them, extractive industries are generally prohibited and hunting and fishing are either prohibited or closely regulated. National and Provincial Reserves and Preserves are set aside for the protection of game. Game may sometimes be taken under regulation according to the species and the season. The laws governing the large national reserves in northern Canada are in part designed to protect the hunting and trapping reserves of the aboriginal population and to protect migratory birds, particularly during the nesting season. The terms reserve and preserve have the same meaning. Federal Bird Sanctuaries are areas defined and administered under the Migratory Birds Convention Act. In general, they serve the purpose of affording protected places along the migratory flyways. Other bird sanctuaries include a large number of private and municipal sanctuaries. Many have been established by private hunters' organizations which have improved water features such as swamps, ponds and lakes in order to assure good breeding and feeding places for ducks and geese.