Overgrazing by livestock is not a major challenge faced by wildlife sanctuaries and national parks in India. The other options are all significant threats to wildlife and their habitats.

Habitat loss and fragmentation in wildlife sanctuaries and national parks in India are primarily caused by deforestation for agriculture, mining and quarrying, and urbanization and infrastructure development.

Tigers are the most commonly targeted wildlife species by poachers in India due to the high demand for their body parts in traditional medicine and the illegal wildlife trade.

The decline in elephant populations in India is primarily due to habitat loss and fragmentation, poaching for ivory, and human-elephant conflict.

Kaziranga National Park in Assam is home to the largest population of one-horned rhinoceros in the world.

Human-wildlife conflict in India is primarily caused by habitat loss and fragmentation, competition for resources, and the expansion of human settlements.

The Ministry of Environment, Forest and Climate Change is the nodal agency responsible for the management and protection of wildlife sanctuaries and national parks in India.

Project Tiger is the flagship species conservation program launched by the Government of India in 2010 to protect tigers and their habitats.

Madhya Pradesh has the highest number of wildlife sanctuaries in India, with 25 sanctuaries.

Nanda Devi National Park in Uttarakhand is the largest national park in India, covering an area of 630.33 sq km.

Hemis National Park in Ladakh is famous for its population of snow leopards, which are found at altitudes of 3,000 to 6,000 meters.

Gir National Park in Gujarat is home to the only population of Asiatic lions in the world.

Velavadar National Park in Gujarat is famous for its population of blackbucks, which are found in large numbers in the grasslands of the park.

Dachigam National Park in Jammu and Kashmir is home to the only population of hangul, which is a subspecies of red deer.

Nameri National Park in Assam is famous for its population of golden langurs, which are found in the evergreen forests of the park.