The establishment of national parks and sanctuaries come under

The establishment of national parks and sanctuaries come under Ex-situ conservation of biodiversity.
Ex-situ conservation means, "off-site conservation". It is the process of protecting an endangered species, variety or breed, of plant or animal outside its natural habitat; for example, by removing part of the population from a threatened habitat and placing it in a new location, an artificial environment which is similar to the natural habitat of the respective animal and within the care of humans, example is zoological parks and wildlife safaris.