DCGI issued another circular in 2008 asking all state drug controllers to direct manufacturers of Diclofenac to label it 'not for veterinary use'.

Despite the notes, rampant use of Diclofenac continued in Bihar.

Once a common site in the state, vultures have seen a steep decline in numbers in the last decade.

'Vultures are now spotted mainly in Bhagalpur, Supaul, Araria and Khagaria districts,' an animal resources department official said.