Just days after the latest reports of the Sundrum Slasher, spectacular video has emerged of another Scottish big cat.

Off duty MoD policeman PC Chris Swallow shot this footage of a large, black feline prowling a railway line. It's difficult to tell the exact size of the creature however comparison with the railway lines gives some feel - it's at least four foot long, definitely bigger than a domestic cat.

PC Swallow describes the cat as being as big as a labrador dog. Since he's a police dog handler he has the experience with animals to make that a reliable estimate.