Police and animal welfare chiefs said they had narrowed the 150 square mile search down to a wooded area near the village of Ballybogey, outside Portrush, Co Antrim.
The big cat - thought to be either a puma or a panther - has been blamed for mauling several sheep after being set loose by a rogue owner who faces prosecution once it is caught, police said.
Police marksmen are on standby to shoot the exotic animal. which has eluded capture for more than a month.
FORGET the beasts of Ballybogey currently at large in north Antrim, because as these exclusive pictures show, it seems yet another big cat is roaming Ulster's countryside.
The picture - which clearly shows a large black cat roaming in a field - was taken by a Dublin-based doctor who spotted the animal close to Slieve Bearnaigh in the Mourne Mountains.