Indigenous mammals include the leopard, hyena, fox, wolf, hare, oryx and ibex. Birds include the vulture, eagle, stork, bustard, Arabian partridge, bee eater, falcon and sunbird. In 2001, Oman had nine endangered species of mammals, five endangered types of birds, and nineteen threatened plant species. Decrees have been passed to protect endangered species, including the Arabian leopard, Arabian oryx, mountain gazelle, goitered gazelle, Arabian tahr, green sea turtle, hawksbill turtle and olive ridley turtle. However, the Arabian Oryx Sanctuary is the first site ever to be deleted from UNESCO's World Heritage List, following the government's 2007 decision to reduce the site's area by 90% in order to clear the way for oil prospectors.