A walker and his family recently witnessed a huge black cat wandering around the remote Dartmoor area.
Researcher of conservation Egil Droge takes a look at the science behind stories of 'alien' big cats in the UK.
The animal, which was standing at the side of the road, closely resembled a lynx or other species of wild cat.
A strand of hair found on a fence following a sheep attack suggests that there are large predatory cats prowling the countryside.
The footage, which reportedly shows an exotic black cat, has generated some heated debate since appearing online.
Recently released footage allegedly shows a large, exotic cat that reportedly roams the wilds of Northumberland.
A woodland trail camera has captured footage of what some believe to be evidence of a panther on the loose.
A woman in Georgia recently awoke to find that she was sharing her bed with a rather unexpected visitor.
A creature resembling a panther or puma made an unexpected appearance during a live TV segment.
A Melbourne carpenter has posted up a photograph he took of a large black cat near the Mornington Peninsula.
A rural crime team has been investigating a spate of unexplained sheep deaths at a farm in Cheshire.
One of the UK's top big cat trackers believes that there is a viable, breeding population of exotic cats in the wild.
Police in Sussex recently attended the scene of a 'big cat' sighting only to find something a lot more innocuous.
Recent accounts have indicated that the Loch Ness Monster is not the only thing lurking in the Scottish wilds.
A Cambridge University worker has photographed a large wildcat with 'big claws' in his garden.
The discovery of a large feline print in the Blue Mountains has reignited speculation of a mystery big cat.
Police in England have discovered the paw prints of a large exotic cat believed to be on the loose in the area.
Emma Adam had been out walking in woods near the town of Ashby when she encountered a large black cat.
A zoo owner has come forward with information that could help to explain the alien big cat phenomenon.
Authorities were notified after a large black creature was spotted chasing deer in North West England.