The correct answer is: a) Migratory birds.
Deepor Beel is a freshwater lake located in the Kamrup district of Assam, India. It is the largest wetland in Assam and is a Ramsar site. The lake is a critical habitat for migratory birds, including pelicans, herons, storks, and ducks. It is also home to a variety of other wildlife, including fish, reptiles, and mammals.
The lake is a popular tourist destination and is also an important source of livelihood for the local people. The lake is threatened by pollution, encroachment, and unsustainable development.
The other options are incorrect because:
- Clouded leopards are not found in Assam.
- Red pandas are found in the Himalayas and southwestern China.
- Black bears are found in the Himalayas, the mountains of central Asia, and North America.