Explanation:

The state bird of Uttar Pradesh is the Sarus Crane ($Antigone \text{ } antigone$). This large, non-migratory crane is known for its majestic appearance and is often found in agricultural fields and wetlands across the state. Option (1) Peacock is the national bird of India, not specifically the state bird of Uttar Pradesh. Option (2) Monal refers to a genus of pheasants, typically found in the Himalayan regions, and is not the state bird of UP. Option (4) Pigeon is a common bird but holds no official state symbol status for Uttar Pradesh. Therefore, the Sarus Crane is the correct answer.