I put a trail cam up once,low level,came back after a few weeks over a hundred pics on it,first few pics fox,then a local tom cat came down the trail sniffed the cam and scent marked it,f**k me dozens of pics of a small number of cats scent marking or sniffing the cam,they wouldn't walk down the track without doing so I wonder if scent marked bedding from a zoo,of whatever big cat is thought to be in the vicinity,placed in front of a cam would get the desired pic.........