The worried owner, who has not been identified, apparently rang the authorities in Dunedin on the county's South Island after she found the bag with 5g (0.2oz) of cannabis inside. ''You hear of cats bringing dead birds and rats home, but certainly in my career I've never seen anything like this before," Sergeant Reece Munro tells the Otago Daily Times , adding the marijuana has a street value of about NZ$100 ($85, £51).