Wildlife constitutes the primary natural heritage, all around the world. Continuous industrialization and deforestation, has posed a threat of extinction to the wildlife. So, to conserve and preserve the natural heritage of the country wildlife sanctuaries, national park, biosphere reserves, etc. are earmarked. Wildlife sanctuaries refer to an area which provides protection and favourable living conditions to the wild animals.
On the other hand, the national park provides protection to the entire set of the ecosystem, i.e. flora, fauna, landscape, etc. of that region. Lastly, biosphere reserves are the protected areas, which tend to conserve the genetic diversity of the plants, animals birds, etc.
The article excerpt attempts to clarify the difference between wildlife sanctuary and national park, so take a read.