The 'shaggy horned wild ibex' is a characteristic faunal species of:

The correct option is

The Himalayas

Explanation

The Himalayan region is characterized by unique high-altitude fauna adapted to extreme cold and rugged terrain. The "shaggy horned wild ibex" refers to the Himalayan Ibex (Capra sibirica hemalayanus), a subspecies of the Siberian Ibex.

Detailed Analysis:

• The Himalayas (Correct): The Himalayan Ibex is distributed across the trans-Himalayan ranges, including Ladakh, Jammu and Kashmir, and Himachal Pradesh. It inhabits precipitous terrain and high-altitude alpine meadows. It is distinct due to its thick, woolly (shaggy) coat which protects it from the harsh winter cold, and its large, backward-curving horns.
• The Western Ghats: This region is a biodiversity hotspot known for the Nilgiri Tahr, another mountain ungulate, but it does not host the Ibex.
• The Thar Desert: The fauna here is adapted to arid conditions, such as the Chinkara (Indian Gazelle) and Blackbuck, rather than high-altitude mountain goats.
• The Sundarbans: This is a mangrove ecosystem famous for the Royal Bengal Tiger and estuarine crocodiles, a habitat entirely unsuitable for the Ibex.

Key Takeaway:

The Himalayan Ibex is a characteristic species of the Trans-Himalayan and Himalayan regions, distinct from the Nilgiri Tahr found in the Western Ghats.