Problems of nature preservation in British territories of central America may be clearly divided between continental countries, British Honduras and British Guiana on the one hand, and the islands on the other; although the fauna of Trinidad and Tobago has much in common with that of the South American continent. The islands of the Greater and Lesser Antilles have been separated long enough from the mainland and from each other, for them to have developed their own plants and animals. Common to continental and island countries, however, are the migratory shore birds of the western hemisphere.