Two dead birds found in Hong Kong in early March have tested positive for H5N1 virus, the city\' s Agriculture, Fisheries and Conservation Department said Monday A black-headed gull was collected at Castle Peak Power Station at Tuen Mun on March 2, while a peregrine falcon was found at Kam Kwai House at Ma On Shan on March 3. Both birds were confirmed to be H5N1-positive after a series of laboratory tests. The department said it would continue to inspect poultry farms to ensure that proper precautions against avian influenza have been implemented.