Tanzania contains around 20% of the species of Africa's enormous warm-blooded animal populace, found over its 21 National parks, reserves, 1 conservation area, and 3 marine parks. Spread over a zone of in excess of 42,000 square kilometres (16,000 sq. mi) and shaping around 38% of the nation's area. Tanzania has 21 national parks, plus a variety of game and forest reserves, including the Ngorongoro Conservation Area. In western Tanzania, Gombe Stream National Park is the site of Jane Goodall's ongoing study of chimpanzee behaviour, which started in 1960.