English: The largest flying bird Sarus Crane, pairs for a lifetime, and at regular intervals demonstrates its relationship thru a courtship dance and a duet that both the birds sing. With a rapidly declining population the Sarus Crane is classified as 'Vulnerable' with a population of 10,000 - 20,000 birds in the wild. Most Sarus Cranes in the region nest in irrigated wet rice fields, some in Uttar Pradesh remaining on their breeding territories all year. Their future is highly dependent on persistence of suitable agricultural conditions and favourable community attitudes. The spread of urban areas and industrial development across wetland areas increases threats from drainage, diversions, and mechanised agriculture, especially if combined with variable rainfalls. In Uttar Pradesh many immature Sarus collide with electricity distribution lines and are killed. Accidental poisonings from agricultural chemicals also pose serious risk.