In which of the following regions of India are you most likely to come across the 'Great Indian Hornbill' in its natural habitat?

1. A

   Sand deserts of northwest India

   Sand deserts of northwest India. The Great Indian Hornbill needs tall wet forests, not Thar dunes. This letter is not the key.

2. B

   Higher Himalayas of Jammu and Kashmir

   Higher Himalayas of Jammu and Kashmir. High cold mountains are not its habitat. This letter is not the key.

3. C

   Salt marshes of western Gujarat

   Salt marshes of western Gujarat. Rann flats do not hold this canopy bird. This letter is not the key.

4. D

   Western Ghats

   Western Ghats. Buceros bicornis lives in evergreen and moist deciduous forests of the Western Ghats (and also northeast India). Among the given regions, the Ghats are the natural-habitat match. That stored letter is the official key.

Summary. Official key is (d) Western Ghats. The Great Indian Hornbill is a large forest hornbill of the Western Ghats and northeast, not of desert, high Himalaya or Gujarat salt marsh. Honour the stored letter (d).