As humans occupy more and more space on earth, animals get displaced and have to move elsewhere.
To protect certain animals and also to protect certain eco-systems, various governments have set up national parks - these are protected areas where human construction is prohibited; and humans are not allowed to hunt or stay permanently.
In the US, there are many national parks. There are even marine national parks to prevent marine animals.

National parks are the reserved places used to protect flora and fauna of an area. National parks are large and diverse reserves which help in protection of different ecosystems. These can protect flora, fauna and many other aspects of the ecosystem. Different wild animals like snow leopard, clouded leopard, marbled cat, panda, black bear, blud sheep, wild ass, toucan, musk deer etc are protected from getting extinct. These are owned by the government. They provide a safe home and are intended for a long time conservation of almost extinct animals and plants.