Many studies on large animal populations have been undertaken by the Department of Wildlife and National Parks (DWNP) while private research (mainly as part of dissertation studies) has played a very important role, particularly in collecting information on large mammals, fish and fisheries. Both research and population censuses have tended to focus on the larger, commercially important or rare and endangered species. Few data have been collected on species of low tourism, hunting or other commercial value in the Okavango Delta region.