Answer : 3. "मोर"
Explanation :

Pneumatic bones, which are bones that are hollow and filled with air sacs, are typically found in birds. The purpose of pneumatic bones is to reduce the overall weight of the bird, aiding in flight.

Among the options provided:

(C) Peacock

Birds like peacocks, being avians, have pneumatic bones. So, the correct answer is (C) Peacock.