Explanation:

- Indian Wild Ass: This animal lives in the Rann of Kutch in Gujarat, India. Habitat destruction, especially due to salt activities, poses a significant threat to its survival.

- Estuarine Crocodile: Found in coastal regions, this species faces threats from habitat loss due to urban development, but not specifically from salt activities.

- Dugong: Sea grasses, dugongs' primary food, are threatened by habitat destruction, but this is more directly linked to coastal development than salt activities.

- Indian Bison (Gaur): This terrestrial animal mainly faces threats from habitat encroachment due to agricultural expansion, not salt activities.