Warning - Images of the slaughtered sheep are contained within this article
A farmer in Northamptonshire is stepping up security after five of her sheep were butchered in their fields.
The flock at Grange Farm in Denton near Northampton has been targeted twice now and it's the latest in a series of sheep attacks across the county.
Police think thieves could be selling the meat they take.
The farmer Esther Arrowsmith says the criminals definitely know what they're doing and they know how to butcher the animals, in terms of what they're leaving behind.
Each sheep is more than £100 to replace but the Arrowsmiths aren't the only farmers counting the cost.
In the village of Denton alone, more than 30 sheep have been killed over the past couple of years - with farms targeted more than once - and it's costing farmers hundreds of pounds.
And across Northamptonshire, there've been six sheep attacks in the past 18 months.
Click below to watch a report by ITV News Northamptonshire reporter Sarah Cooper